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35-601: It is located at a bay of the south-eastern part of Skagerrak . The beaches of Uddevalla are filled with seashells and Uddevalla has one of the largest shell- banks in the world. Uddevalla has a port and it once had a large shipyard, the Uddevallavarvet ("Uddevalla wharf"), which was the largest employer in Bohuslän during the 1960s. The 1970s recession , that affected the Swedish shipyard industry severely, led to

70-468: A channel or opening of water in an otherwise ice-covered body of water. There is no evidence to suggest a connection with the modern Danish word rak (meaning rabble or riff-raff). It is therefore likely that the Skagerrak was named by Dutch seafarers, as was the adjacent Kattegat . The Skagerrak is 240 km (150 mi) long and between 80 and 140 km (50 and 87 mi) wide. It deepens toward

105-594: A new railroad , the Bohus Line , also contributed to the town's recovering economy. A prominent person in Uddevalla's history was Ture Malmgren , newspaper publisher and progressive liberal politician. During the 1958 FIFA World Cup , Uddevalla was one of twelve Swedish towns to host matches, which were played at the Rimnersvallen stadium. After the Swedish shipyard crisis during the 1980s, resulting in

140-482: A range seafloor habitats previously thought to be sandy with a low density of wildlife. Dead Man’s Fingers corals were again among the species documented for the first time in these coastal habitats. Scientists and environmental institutions have expressed concern about the increasing pressure on the ecosystem in Skagerrak. The pressure has already had negative impacts and is caused by cumulative environmental effects, of which direct human activities are only one piece of

175-540: A unique variety of Atlantic cod. It also contains sandy and stony reefs and cold-water coral reefs. Environmental institutions have expressed concern about increasing pressure on the ecosystem due to human activities and climate change. Protections are in place, with several marine protected areas in Skagerrak, including Ytre Hvaler National Park in Norway and Kosterhavet National Park in Sweden. The meaning of Skagerrak

210-586: Is twinned with: Skagerrak The Skagerrak ( Danish: [ˈskɛːjɐˌʁɑk] , Norwegian: [ˈskɑ̀ːɡərɑk] , Swedish: [ˈskɑ̌ːɡɛrak] ) is a strait running between the Jutland peninsula of Denmark , the east coast of Norway and the west coast of Sweden , connecting the North Sea and the Kattegat sea. The Skagerrak contains some of the busiest shipping routes in

245-538: Is about 3,600 km (1,400 sq mi) and includes a wide variety of habitats, from shallow sandy and stony reefs in Sweden and Denmark to the depths of the Norwegian trench . The International Hydrographic Organization defines the limits of the Skagerrak as follows: On the West. A line joining Hanstholm ( 57°07′N 8°36′E  /  57.117°N 8.600°E  / 57.117; 8.600 ) and

280-777: Is among the busiest straits in the world. In 1862, a short cut, the Thyborøn Channel at the Limfjord was constructed in Denmark through Skagerrak from the North Sea by going directly to the Kattegat . The Limfjord supports only minor transports though. In both world wars, the Skagerrak was strategically very important for Germany. The biggest sea battle of the First World War , the Battle of Jutland , also known as

315-705: Is most likely the Skagen Channel/Strait. Skagen is a town near the northern cape of Denmark (The Skaw). In Dutch , rak means 'straight waterway ', as seen in Dutch hydronyms such as Damrak , Gouderak , Langerak , Tuikwerderrak, and Volkerak ), cognate with reach . The ultimate source of this syllable is the Proto-Indo-European root *reg-, 'straight'. Rak means 'straight' as in 'straight ahead' in modern Norwegian and Swedish. Råk in both modern Norwegian and Swedish refers to

350-401: Is typically reserved for much larger, wider features of the marine environment. There are exceptions, with straits being called canals; Pearse Canal , for example. Straits are the converse of isthmuses . That is, while a strait lies between two land masses and connects two large areas of ocean, an isthmus lies between two areas of ocean and connects two large land masses. Some straits have

385-566: The Automatic Identification System (AIS). Skagerrak is popular for recreational activities in all three countries. There are many summer house residences and several marinas along the coasts. The Skagerrak is habitat for approximately 2,000 marine species, many of them adapted to its waters. For example, a variety of Atlantic cod called the Skagerrak cod spawns off the Norwegian coast. The eggs are buoyant and

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420-468: The Suez Canal . Although rivers and canals often provide passage between two large lakes, and these seem to suit the formal definition of strait, they are not usually referred to as such. Rivers and often canals, generally have a directional flow tied to changes in elevation, whereas straits often are free flowing in either direction or switch direction, maintaining the same elevation. The term strait

455-687: The Battle of the Skagerrak, took place here May 31 to June 1, 1916. In the Second World War , the importance of controlling this waterway, the only sea access to the Baltic, was the motive for the German invasions of Denmark and Norway as well as the construction of the northern parts of the Atlantic Wall . Both of these naval engagements have contributed to the large number of shipwrecks in

490-813: The Danish waters of Skagerrak west of Hirtshals , but more might be discovered in future surveys. Bubbly reefs are very rare in Europe and supports a very varied ecosystem. With the centuries-long heavy international seatraffic of Skagerrak, the seabed also holds an abundance of shipwrecks. Wrecks on shallow waters, provides a firm anchoring for several corals and polyps and explored wrecks have been revealed to support Dead Man's Fingers corals, Brittle stars and large wolffish . A 2020 seafloor mapping project around Jammerbugten in Skaggerak, ran by Danish explorer Klaus Thymann , found evidence of much greater biodiversity in

525-527: The Naze ( Lindesnes , 58°N 7°E  /  58°N 7°E  / 58; 7 ). On the Southeast. The Northern limit of the Kattegat [A line joining Skagen (The Skaw, North Point of Denmark) and Paternosterskären ( 57°54′N 11°27′E  /  57.900°N 11.450°E  / 57.900; 11.450 ) and thence Northeastward through the shoals to Tjörn Island ]. Older names for

560-687: The Norwegian coast, reaching over 700 m at the Norwegian Trench . Some ports along the Skagerrak are Oslo , Larvik and Kristiansand in Norway , Skagen , Hirtshals and Hanstholm in Denmark and Uddevalla , Lysekil and Strömstad in Sweden . The Skagerrak has an average salinity of 80 practical salinity units , which is very low, close to that of brackish water , but comparable to most other coastal waters. The area available to biomass

595-567: The Norwegian coast. It has an average salinity comparable to other coastal waters, housing a variety of habitats. Historically, the Skagerrak was the only access to the Baltic Sea until the construction of the Eider Canal in 1784. During both World Wars, the strait held strategic importance for Germany. Presently, it remains one of the busiest straits worldwide. The Skagerrak is a habitat for approximately 2,000 marine species, including

630-643: The Skagerrak. Skagerrak is a busy shipping lane, with c. 7,500 individual vessels (excluding fishing vessels) from all over the world visiting in 2013 alone. Cargo ships are by far the most common vessel in Skagerrak at c. 4,000 individual ships in 2013, followed by tankers , which are nearly half as frequent. When viewed in combination with the Baltic Sea area, ships from 122 different nationalities visited in 2013, with most of these carrying cargo or passengers within Europe, regardless of their flag state . Nearly all commercial vessels in Skagerrak are tracked by

665-597: The aftermath of the fire in 1806, the decrease in herring fishing and the opening of the Trollhätte Canal . In 1870–80, Uddevalla began to attract new industries. Much of that development can be attributed to the Scottish businessman William Thorburn, who is said to have been amazed by the town's beauty and therefore settled down in Uddevalla with his wife Jessy Macfie in 1822. He founded a number of industries, starting mostly with textile companies. The building of

700-492: The closing of the Uddevallavarvet , Uddevalla suffered an economic setback. Over the thirty years following that, the town has recovered and the population is once again increasing, slowly but steadily. All the high schools in Uddevalla are administered as one school, the Uddevalla Gymnasieskola ("Uddevalla High School"), which is now the largest high school in Sweden. The school has 4,000 students attending

735-450: The closing of the wharf in 1985. Uddevalla received its town privileges in 1498, but thought to have been a place of trade long before that. Formerly, Uddevalla belonged to Norway, and its name today comes from the original Norwegian Oddevald , which later turned into Oddevold . Due to its close location to Sweden and Denmark , it was often besieged. In 1612, it was burnt down by Swedish troops led by Jesper Mattson Krus and in 1644, it

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770-677: The combined Skagerrak and Kattegat were the Norwegian Sea or Jutland Sea ; the latter appears in the Knýtlinga saga . Until the construction of the Eider Canal in 1784 (a predecessor to the Kiel Canal ), Skagerrak was the only way in and out of the Baltic Sea . For this reason, the strait has had busy international traffic for centuries. After the Industrial Revolution , the traffic increased and today Skagerrak

805-550: The flow, the surface water still flows, for the most part, at the same elevation on both sides and through the strait in both directions. In some straits there may be a dominant directional current through the strait. Most commonly, it is a narrowing channel that lies between two land masses . Some straits are not navigable, for example because they are either too narrow or too shallow, or because of an unnavigable reef or archipelago . Straits are also known to be loci for sediment accumulation. Usually, sand-size deposits occur on both

840-742: The following branches of the high school: There are also many primary schools in Uddevalla, some of them are: Agnebergshallen is an indoor sports arena for various sports including handball . The home ground for the IK Oddevold is the outdoor arena Rimnersvallen . A large indoor arena, the Rimnershallen , is next to the Rimnersvallen. It is used for handball and floorball as well as other sports. The following sports clubs are located in Uddevalla: Uddevalla

875-771: The hatchlings feed on zooplankton . Juveniles sink to the bottom where they have a shorter maturity cycle (2 years). They do not migrate but remain local to Norwegian fjords . The variety of habitats and the large volume of plankton on the surface support prolific marine life. Energy moves from the top to the bottom according to Vinogradov 's ladder of migrations; that is, some species are benthic and others pelagic , but there are graded marine layers within which species move vertically for short distances. In addition, some species are benthopelagic , moving between surface and bottom. The benthic species include Coryphaenoides rupestris , Argentina silus , Etmopterus spinax , Chimaera monstrosa and Glyptocephalus cynoglossus . On

910-492: The only known coral reef in the country. The Tisler Reef in the Norwegian marine protection of Ytre Hvaler National Park is the largest known coral reef in Europe. Lophelia reefs are also present in the Norwegian trench and they are known from the shallow waters of many Norwegian fjords. Skagerrak also holds a number of rare bubble reefs ; biological reefs formed around cold seeps of geological carbohydrate outgassings, usually methane . These rare habitats are mostly known from

945-472: The potential to generate significant tidal power using tidal stream turbines . Tides are more predictable than wave power or wind power . The Pentland Firth (a strait) may be capable of generating 10  GW . Cook Strait in New Zealand may be capable of generating 5.6 GW even though the total energy available in the flow is 15 GW. Straits used for international navigation through

980-464: The puzzle. Climate change and ocean acidification are expected to have increasing impacts on the Skagerrak ecosystem in the future. Skagerrak and the North Sea receives considerable inputs of hazardous material and radioactive substances . Most is ascribed to long-range transport from other countries, but not all. Marine litter is also a growing problem. Until recently, waste water and sewage pouring into Skagerrak from settlements and industries

1015-423: The territorial sea between one part of the high seas or an exclusive economic zone and another part of the high seas or an exclusive economic zone are subject to the legal regime of transit passage ( Strait of Gibraltar , Dover Strait , Strait of Hormuz ). The regime of innocent passage applies in straits used for international navigation (1) that connect a part of high seas or an exclusive economic zone with

1050-406: The top are Clupea harengus , Scomber scombrus , Sprattus sprattus . Some species that move between are Pandalus borealis , Sabinea sarsi , Etmopterus spinax . Apart from sandy and stony reefs, extensive cold water coral reefs , mostly of Lophelia , are growing in Skagerrak. The Säcken Reef in the Swedish marine protection of Koster Fjord is an ancient cold water coral reef and

1085-574: The two opposite strait exits, forming subaqueous fans or deltas . The terms channel , pass , or passage can be synonymous and used interchangeably with strait , although each is sometimes differentiated with varying senses. In Scotland, firth or Kyle are also sometimes used as synonyms for strait. Many straits are economically important. Straits can be important shipping routes and wars have been fought for control of them. Numerous artificial channels, called canals , have been constructed to connect two oceans or seas over land, such as

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1120-451: The world, with vessels from every corner of the globe. It also supports an intensive fishing industry. The ecosystem is strained and negatively affected by direct human activities. Oslo and Gothenburg are the only large cities in the Skagerrak region. The strait is likely named after Skagen , a town near the northern cape of Denmark, with 'Rak' meaning 'straight waterway'. The Skagerrak is 240 km long and 80–140 km wide, deepening towards

1155-432: Was herring fishing. The town was also noted for the great fires that damaged the city on several occasions. The most devastating fire was in 1806, when the whole town burned to the ground. Only four houses were left untouched and 4,000 people became homeless. During the 19th century, Uddevalla had trouble getting out of its own recession; poverty and alcoholism were widespread among the population. The reasons were mainly

1190-428: Was not treated at all. In combination with wash out of excessive nutrients from conventional farming , this has often led to large algae blooms . There are several marine protections in Skagerrak, including: Skaagerak is the setting of the popular television show Badehotellet from Denmark. Strait A strait is a water body connecting two seas or two water basins. While the landform generally constricts

1225-499: Was once again burnt down, this time by Swedish commander Harald Stake . In 1658, it was ceded to Sweden at the treaty of Roskilde . The Norwegians recaptured the town a year later, and in 1660, it was once again ceded to Sweden at the peace treaty of Copenhagen . Later, Norway annexed Uddevalla and the nearby fortress on the Galleberg repeatedly, the last time in 1788. In the 18th and 19th century, Uddevalla's main source of income

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