The Schuylkill River was once a beautiful river that cut through the western side of Philadelphia. However after the bombs polluted the waters, it became a toxic delivery system pumping radioactive particles throughout the region. It's not all bad though, the river creates a natural barrier between the inhabited end of Philadelphia from the end that is now run by the bloodthirsty mutant animals that broke out of the zoo. The river is also good if you want to catch fish, tasty tasty three eyed fish...