Northumberland

Northumberland, county, central Pennsylvania, U.S., consisting of a mountainous region in the Appalachian Ridge and Valley physiographic province bounded to the west by the Susquehanna and West Branch Susquehanna rivers. Other waterways include Chillisquaque, Shamokin, Mahanoy, and Mahantango creeks. Shikellamy State Park, situated at the point where the West Branch Susquehanna and Susquehanna join, is named for an 18th-century Iroquois leader who governed the Susquehannock (Susquehanna) Indian village of Shamokin there; the site is now...