A valley is a relatively large hollow or depression bounded by hills or mountains on Earth's surface that is developed by stream erosion or glacial activity and that is drained externally. A basin is another hollow or depression on Earth's surface, but it has no outlet to drain the water.
Location in Allegheny County and the state of Pennsylvania. Gibsonia is an unincorporated community and census-designated place in Richland Township, Allegheny County, in the U.S. state of Pennsylvania, north of the city of Pittsburgh. It had a population of 2,733 at the 2010 Census. Its ZIP code is 15044.
Show map of the US. Point Marion is a borough in Fayette County, Pennsylvania, United States. The population was 1,159 at the 2010 census, down from 1,333 at the 2000 census. It is served by the Albert Gallatin Area School District.