The Thracian Sea ( Greek : Θρακικό Πέλαγος , Thrakiko Pelagos ; Turkish : Trakya Denizi , "Тракийско море" - Bulgarian language) is the northernmost part of the Aegean Sea . It is bounded by Macedonia and Thrace as well as northwestern Turkey . It connects to the Black Sea through the Dardanelles Straight , the Marmara Sea , and the Bosphorus Straight .
44-1005: The entire area of the sea lies north of the 40th parallel . Its length from east to west is from 23°E to about 25.8°E, or from the Strymonian Gulf east to the northernmost part of the Gallipoli peninsula and the width from north to south is about 40.25°N to 41°N , or from the Dardanelles north to the boundary between the Xanthi and the Rhodope regional units. Islands in the Thracian Sea include Thasos and Samothrace in Greece , and Gökçeada ( Imvros in Greek) in Turkey . In
88-648: A Historic Preservation Code was passed. In 1976, a residential-growth management ordinance, the Danish Plan, was passed. The city of Boulder is located in the Boulder Valley, where the Rocky Mountains meet the Great Plains . The Flatirons , slabs of sedimentary stone tilted up on the foothills, are located west of the city and are a widely recognized symbol of Boulder. Boulder Creek
132-472: A few naked runners were observed by locals. Several illegal attempts, resulting in arrests, have been made to restart the run, but no serious effort has been mounted. For several years on April 20, thousands of people gathered on the CU Boulder campus to celebrate 420 and smoke marijuana at and before 4:20 pm. The 2010 head count was officially between 8,000 and 15,000 with some discrepancy between
176-466: A group of friends and friends of friends in the early 90's riding bicycles around Boulder into the social cycling event it is today. Some enthusiasts gather wearing costumes and decorating their bikes; themes are an integral part of the cruiser tradition. Boulder Police began following the cruiser ride as it gained in popularity in the early 2000s. Issues with underage drinking, reckless bicycle riding, and other nuisance complaints led organizers to drop
220-469: Is a tributary of the South Platte River . At the 2020 United States Census , the city had a total area of 17,514 acres (70.877 km ), including 664 acres (2.689 km ) of water. The 40th parallel , 40 degrees north latitude, runs through Boulder and can be easily recognized as Baseline Road today. Boulder lies in a wide basin beneath Flagstaff Mountain just a few miles east of
264-491: Is an annual one-week conference featuring dozens of discussion panels on contemporary issues. The internationally syndicated radio program eTown has its headquarters at eTown Hall , at the intersection of 16th and Spruce Streets, in downtown Boulder. Most tapings of this weekly show are done at eTown Hall. Beginning in 1983, hundreds of people head to the Boulder Reservoir on New Year's Day to take part in
308-556: Is home to multiple dance companies and establishments. Boulder Ballet was founded by former American Ballet Theatre dancer Larry Boyette in the 1970s as part of the Ballet Arts Studios. Lemon Sponge Cake Contemporary Ballet was founded in 2004 by Robert Sher-Machherndl, former principal dancer of the Dutch National Ballet and Bavarian State Ballet . The Conference on World Affairs , started in 1948,
352-485: Is the primary flow of water through Boulder. The creek was named before the city's founding for all of the large granite boulders that have cascaded into the creek over the eons. It is from Boulder Creek that the city is believed to have taken its name. Boulder Creek has significant water flow, derived primarily from snow melt and minor springs west of the city. The creek flows into St. Vrain Creek east of Longmont , which
396-609: Is the principal city of the Boulder metropolitan statistical area , which had 330,758 residents in 2020, and is part of the Front Range Urban Corridor . Boulder is located at the base of the foothills of the Rocky Mountains , at an elevation of 5,430 feet (1,655 m) above sea level. The city is 25 miles (40 km) northwest of the Colorado state capital of Denver . Boulder is a college town , hosting
440-650: Is the southern baseline for Canada 's National Topographic System . Starting in Spain at the Prime Meridian and heading eastwards, the parallel 40° north passes through: The parallel 40° north formed the boundary between the Kansas and Nebraska territories, as per the Kansas–Nebraska Act of 1854. It remains the boundary between the modern states of Kansas and Nebraska . The parallel 40° north formed
484-575: Is usually shallow. Due to the high elevation, a strong warming sun can quickly melt snow cover during the day and Chinook winds bring rapid warm-ups throughout the winter months. Summers are warm, with frequent afternoon thunderstorms. There are roughly 30 days of 90 °F (32 °C) or above each year. Diurnal temperature variation is typically large due to the high elevation and semi-arid climate. Daytime highs are generally cooler than those of most Colorado cities with similar elevations. The highest recorded temperature of 104 °F (40 °C)
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#1732764846350528-829: The Mediterranean Sea , Asia , the Pacific Ocean , North America , and the Atlantic Ocean . At this latitude the sun is visible for 15 hours, 1 minute and 28 seconds during the summer solstice and 9 hours, 20 minutes during the winter solstice . On 21 June, the maximum altitude of the sun is 73.44 degrees, while it's 26.56 degrees on 21 December. The maximum altitude of the Sun is > 35.00º in October and > 28.00º in November. The 40th parallel north
572-554: The University of Colorado Boulder , the flagship and largest campus of the University of Colorado system as well as numerous research institutes . Archaeological evidence shows that Boulder Valley has been continuously inhabited by Native American tribes for over 13,000 years, beginning in the late Pleistocene era. Throughout the Paleo-Indian, Archaic, and Late Prehistoric periods, Indigenous peoples moved seasonally between
616-573: The Boulder Bach Festival is an annual festival celebrating the life, legacy, and music of J.S. Bach . The festival is led by Executive Director Zachary Carrettin and Artistic Director Mina Gajic. Founded in 1988, Colorado MahlerFest celebrates the legacy of composer Gustav Mahler through an annual festival. Under Artistic Director Kenneth Woods , The Colorado MahlerFest Orchestra draws together young professionals, conservatory and university students, and advanced amateurs. Boulder
660-800: The Cheyenne-Arapaho Reservation. By 1862, the creek had yielded $ 100,000 in gold, and Boulder's population exceeded 300. On November 7, 1861, the Colorado General Assembly passed legislation to locate the University of Colorado in Boulder. On September 20, 1875, the first cornerstone was laid for the first building (Old Main) on the CU campus. The university officially opened on September 5, 1877. In 1907, Boulder adopted an anti- saloon ordinance. In 1916, statewide prohibition started in Colorado, and ended with
704-538: The Norlin Quad, and having out-of-town law enforcement agencies help secure the campus. In 2013, April 20 fell on a Saturday. The university continued the 420 party ban and closed the campus to visitors. In 2015 the government conceded and once again opened the park to visitors on April 20. The Happy Thursday Cruiser Ride is a weekly bicycle ride in Boulder Colorado. The Boulder Cruiser Ride grew from
748-455: The Thracian Sea is a habitat for the endangered Black Sea harbor porpoise ( Phocoena phocoena relicta) . 40°22′N 25°10′E / 40.367°N 25.167°E / 40.367; 25.167 40th parallel north Download coordinates as: The 40th parallel north is a circle of latitude that is 40 degrees north of the Earth's equatorial plane . It crosses Europe ,
792-637: The allocation of 1,800 acres (7.3 km ) of mountain backdrop/watershed extending from South Boulder Creek to Sunshine Canyon. Boulder has created an Urban Wildlife Management Plan which sets policies for managing and protecting urban wildlife. The city's Parks and Recreation and Open Space and Mountain Parks departments have volunteers who monitor parks, including wetlands, lakes, etc., to protect ecosystems. From time to time, parks and hiking trails are closed to conserve or restore ecosystems. Traditionally, Boulder has avoided using chemical pesticides to control
836-583: The annual polar bear plunge . With rescue teams standing by, participants use a variety of techniques to plunge themselves into the freezing reservoir. Once the plunge is complete, swimmers retreat to hot tubs on the reservoir beach to revive themselves from the cold. Starting in 1998, dozens of people have taken part in a Halloween run down the city's streets wearing only shoes and a hollowed-out pumpkin on their heads. In 2009, local police threatened participants with charges of indecent exposure , and no naked runners were reported in official newscasts, although
880-540: The area. Modern Boulder was founded in late 1858 when prospectors led by Thomas Aikins arrived at Boulder Canyon during the Colorado Gold Rush. Arapaho leader Niwot allowed them to stay for the winter, but the settlers abused this peaceful approach, and some later took part in the Sand Creek massacre of Arapaho. In early 1859, gold was discovered along Boulder Creek, drawing more miners and merchants to
924-599: The area. The Boulder City Town Company was formed in February 1859 to establish a settlement at the canyon mouth. By 1860, it had 70 cabins, occupied mainly by Anglo families. Non-whites like Chinese miners and black residents were part of early Boulder but rarely pictured. In 1861, Boulder County was created, and the Arapaho were forced to relocate per the Treaty of Fort Wise. With declining numbers, Niwot's band soon moved to
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#1732764846350968-399: The city. The population density was 3,942.7 inhabitants per square mile (1,522.3/km ). There were 43,479 housing units at an average density of 1,760.3 units per square mile (679.7 units/km ). The racial makeup of the city was 88.0% White, 0.9% Black or African American, 0.4% Native American, 4.7% Asian, 0.1% Pacific Islander, 3.2% some other race, and 2.6% from two or more races. 8.7% of
1012-545: The compromise boundary between the overlapping claims of these two colonies. The parallel 40° north passes through the cities of Philadelphia, Pennsylvania , Boulder, Colorado , and Columbus, Ohio ; as well as northern suburbs of Indianapolis, Indiana and the southern suburbs of Pittsburgh, Pennsylvania . The parallel goes directly through the John Glenn Columbus International Airport , with runway 10L-28R lying immediately north of
1056-521: The continental divide and about 25 miles (40 km) northwest of Denver. Arapahoe Glacier provides water for the city, along with Boulder Creek, which flows through the center of the city. Denver International Airport is located 45 miles (72 km) southeast of Boulder. In 1899, government preservation of open space around Boulder began, with the Congress of the United States approving
1100-579: The cruiser ride as a public event. Returning to an underground format, where enthusiasts must become part of the social network before gaining access to event sites, the Boulder Cruiser Ride has continued as a local tradition. On May 30, 2013, over 400 riders attended the Thursday-night Cruiser Ride in honor of "Big Boy", an elk that was shot and killed on New Year's Day by an on-duty Boulder Police officer. Boulder
1144-590: The ecological processes that sustain them and to reduce the wildfire risk to forest and human communities. Boulder has a temperate climate typical for much of the state and receives many sunny or mostly sunny days each year. Boulder is considered semi-arid (Köppen: BSk ) or humid subtropical (Köppen: Cfa ) within the Köppen climate classification due to its relatively high yearly precipitation and average temperatures remaining above 32 °F (0 °C) year-round. Winter conditions range from generally mild to
1188-410: The estimated median household income in Boulder was $ 57,112, and the median family income was $ 113,681. Male full-time workers had a median income of $ 71,993 versus $ 47,574 for females. The per capita income for the city was $ 37,600. 24.8% of the population and 7.6% of families were below the poverty line. Out of the total population, 17.4% of those under 18 and 6.0% of those 65 and older were living below
1232-539: The insect population. However, with the threat of West Nile virus , the city began an integrative plan to control the mosquito population in 2003 that includes chemical pesticides. Residents can opt out of the program by contacting the city and asking that their areas not be sprayed. Under Boulder law, exterminating prairie dogs requires a permit. In 2005, the city experimented with using goats for weed control in environmentally sensitive areas. Goats naturally consume diffuse knapweed and Canada thistle , and although
1276-690: The largest race in the US in which all participants are timed and the fifth largest road race in the world. Founded in 1958, the Boulder Philharmonic Orchestra is a professional orchestra under the leadership of its Music Director Michael Butterman. Founded in 1976 by Giora Bernstein , the Colorado Music Festival presents a summer series of concerts in Chautauqua Auditorium . Founded in 1981,
1320-671: The line, runway 10R-28L lying slightly south of it, and the line going through the northernmost edges of the terminal. It also passes through the main campus of The Ohio State University ; specifically, it cuts directly across the Oval greenspace, between University Hall and the William Oxley Thompson Memorial Library. Ohio Stadium , one of the largest stadiums in the world, barely misses the parallel 40° north (6 seconds or 185 metres (607 ft) above 40° north). Baseline Road in Boulder, Colorado, traces
1364-426: The local papers and the university administrators, who have been thought to have been attempting to downplay the event. Eleven citations were given out whereas the year before there were only two. 2011 was the last year of mass 420 partying at CU as the university, in 2012, took a hard stance against 420 activities, closing the campus to visitors for the day, using smelly fish fertilizer to discourage gathering at
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1408-414: The mountain backdrop from development. In 1967, city voters approved a dedicated sales tax to acquire open space to contain urban sprawl . In 1970, Boulder created a "comprehensive plan" to dictate future zoning, transportation, and urban planning decisions. Hoping to preserve residents' views of the mountains, in 1972, the city enacted an ordinance limiting the height of newly constructed buildings. In 1974,
1452-536: The mountains and plains, taking shelter in winter along the Front Range trough where Boulder now lies. By the 1500s, the area was occupied by Ute tribes, joined by Arapaho tribes in the early 1800s. The Indigenous Nations who have ties to the Boulder Valley include the Apache , Arapaho , Cheyenne , Comanche , Kiowa , Pawnee , Shoshone , Sioux , and Ute peoples. In the 1800s, Euro-American settlers colonized
1496-488: The occasional bitterly cold. Highs average in the mid to upper 40s °F (7–9 °C). There are 4.6 nights annually where the temperature drops to 0 °F (−18 °C). Because of orographic lift , the mountains to the west often dry out the air passing over the Front Range , shielding the city from precipitation in winter, though heavy snowfalls may occur. Snowfall averages 88 inches (220 cm) per season. Snow depth
1540-597: The original northern boundary of the British Colony of Maryland . A subsequent royal grant gave the Colony of Pennsylvania land north of the 40th parallel but mistakenly assumed it would intersect the Twelve Mile Circle , which it does not. Pennsylvania's border was thus unclear and the colony pushed for a border far south of the 40th parallel. The Mason–Dixon Line was drawn between 1763 and 1767 as
1584-427: The parallel 40° north. Thistle, Utah , a ghost town since 1983, is slightly (30 seconds or 956 metres (0.594 mi)) below 40° north. Boulder, Colorado Boulder is a home rule city in and the county seat of Boulder County, Colorado , United States. With a population of 108,250 at the 2020 census , it is the most populous city in the county and the 12th-most populous city in Colorado. Boulder
1628-409: The population were Hispanic or Latino of any race. There were 41,302 households, of which 19.1% had children under 18 living with them, 32.2% were headed by married couples living together, 5.5% had a female householder with no husband present, and 59.6% were non-families. 35.8% of all households comprised individuals, and 7.1% were someone living alone who was 65 or older. The average household size
1672-465: The poverty line. In 2010, the Boulder MSA had a gross metropolitan product of $ 18.3 billion, the 110th largest metropolitan economy in the United States. In 2007, Boulder became the first city in the United States to levy a carbon tax . In 2013, Boulder appeared on Forbes magazine's list of Best Places for Business and Careers. In the city's 2022 Annual Comprehensive Financial Report,
1716-555: The program was not as effective as it was hoped, goats will still be considered in future weed control projects. In 2010, goats were used to keep weeds under control at the Boulder Reservoir. The city's Open Space and Mountain Parks department manages approximately 8,000 acres (32 km ) of protected forest land west of the city, in accordance with a 1999 Forest Ecosystem Management Plan. The plan aims to maintain or enhance native plant and animal species, their communities,
1760-487: The repeal of national prohibition in 1933. Median home prices rose 60% from 2010 to 2015 to $ 648,200. In 2024, the City Council of Boulder repealed a long-standing law that prevented Boulder from increasing new residential units by more than 1% in a year. In 1959, city voters approved the "Blue Line" city-charter amendment, which restricted city water service to altitudes below 5,750 feet (1,750 m), to protect
1804-941: The south, the sea extends to the north coast of the island of Lemnos . The bays and gulfs include the Ierissian Gulf to the southwest, the Strymonian Gulf where the Strymon River empties, the Kavala Gulf and the Saros Gulf in Turkey. Rivers emptying into this portion of the gulf include the Nestos and the Evros/Meriç . The famous thermal springs are Loutra Eleftheron in Kavala. The northern part of
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1848-545: The top employers are: Boulder has hosted a 10 km road run , the Bolder Boulder , on Memorial Day every year since 1979. The race involves over 50,000 runners, joggers, walkers, and wheelchair racers, making it one of the largest road races in the world. It has the largest non- marathon prize purse in road racing. The race culminates at Folsom Field with a Memorial Day Tribute. The 2007 race featured over 54,000 runners, walkers, and wheelchair racers, making it
1892-523: Was 2.16, and the average family size was 2.84. Boulder's population is younger than the national average, largely due to the presence of university students. The median age at the 2010 census was 28.7 years compared to the U.S. median of 37.2 years. In Boulder, 13.9% of the residents were younger than 18, 29.1% from 18 to 24, 27.6% from 25 to 44, 20.3% from 45 to 64, and 8.9% were 65 or older. For every 100 females, there were 105.5 males. For every 100 females age 18 and older, there were 106.2 males. In 2011,
1936-493: Was on June 25, 2012. The record low was −33 °F (−36 °C) on January 17, 1930. The coldest high temperature, −12 °F (−24 °C), was on February 4, 1989. The warmest overnight low was on July 20, 1998, with a temperature of 82 °F (28 °C) Boulder is the principal city of the Boulder, CO Metropolitan Statistical Area . In the 2010 census, there were 97,385 people, 41,302 households, and 16,694 families in
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