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.
Fayette City is a borough in Fayette County, Pennsylvania, United States. The population was 714 at the 2000 census. It is served by the Belle Vernon Area School District. Like many towns around it, Fayette City has been home to many coal miners supporting the coal industry in the region. It was the site of the Naomi Mine explosion, December 7 1907. Fayette City is located at 40Â°6â²2â³N 79Â°50â²20â³W / 40.10056Â°N 79.83889Â°W / 40.10056; -79.83889 (40.100647, -79.838913).