Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Looking up: Township Upper Darby Township Upper Merion Township Warminster Township West Chester Whitehall Township York Township Regions Allegheny Mountains Allegheny National Forest Allegheny Plateau Bald Eagle Valley Blue Ridge Coal Region Cumberland Valley Delaware Valley Dutch Country Endless Mountains Great Valley Happy Valley Laurel Highlands Lebanon Valley Lehigh Valley Mahoning Valley Main Line Nittany Valley Northeastern Northern Tier North Central North Penn Valley Ohio Valley Oil Region Oley Valley Pennsylvania Highlands Pennsylvania Wilds Penns Valley Piedmont Pocono Mountains Ridge