On Centre | Penn State: Rejuvenated relief map shows ups, downs of Pennsylvania terrain By Lori Falce - [email protected]. Updated August 14, 2015 9:51 PM.

Pennsylvania is one of the most flood-prone states in the nation. Only 186 of its 2,571 communities are regarded by the U.S. Geological Survey as safe from high water. The rest — all 2,385 of… ...