Forbidden Drive is an 8.

5-mile gravel and asphalt trail along Wissahickon Creek in Philadelphia and Montgomery counties, offering easy-to-moderate hiking and biking access with multiple parking areas at Fort Washington State Park, Flourtown Day Use Area, and Philadelphia locations.

The trail features scenic creek views, historic sites, and connections to SEPTA Regional Rail, though swimming in the creek is prohibited and all trails close at dusk with a 10 p. m. park curfew.

Fishing is permitted under Pennsylvania Fish and Boat Commission regulations, and bicycles are allowed on designated trails with a 7 mph speed limit.