Bodies of Water Bordering Pennsylvania

Pennsylvania has two natural water boundaries:

1. Lake Erie – Forms the northwestern border (Erie County). Provides 51 mi (82 km) of shoreline; only Great Lakes access.
2. Delaware River – Forms the eastern border with New Jersey (from Hancock, NY to Delaware Bay). Philadelphia County fronts the tidal river.

Major internal rivers: Ohio (west), Allegheny, Monongahela (Pittsburgh), Susquehanna (central), Schuylkill (Philly). But only Lake Erie and Delaware River are state borders.