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.
Port Gibson is a city in Claiborne County, Mississippi, United States. The population was 1,840 at the 2000 census. It is the county seat of Claiborne County. Chartered as a town on March 12, 1803, Port Gibson is Mississippi's third-oldest European-American settlement, being occupied in 1729 by French colonists, as it was then within French-claimed territory, La Louisiane.