The 1,800 acres of Wissahickon Valley Park are part of Philadelphia’s 9,200-acre Fairmount Park, one of the largest city parks in the world. A lovely, wooded valley with Wissahickon Creek running through its entire seven-mile length, the Park extends from Chestnut Hill in the north to Manayunk in the southwest. Forbidden Drive, a wide gravel road closed to automobile traffic, parallels the Creek and the Park is criss-crossed by more than 50 miles of often-rugged trails. Since 1924, the Friends of the Wissahickon (FOW), a non-profit organization, has been dedicated to working in and advocating for the Park. FOW is the oldest and one of the largest of the more than 80 Friends of Parks groups in Philadelphia. Cooperating closely with the city’s Fairmount Park Commission, FOW conserves forest and creek, restores trails and preserves the Park’s historical structures.