Greenwood Lake is an interstate lake approximately seven miles long, straddling the border of New York and New Jersey. It is located in the Town of Warwick and the Village of Greenwood Lake, New York and West Milford, New Jersey. It is the source of the Wanaque River.
Location: Orange County, New York / Passaic County, New Jersey
Primary outflows: Wanaque River
Basin countries: United States
Surface area: 1,920 acres (7.8 km²)
Surface elevation: 623 ft (190 m)
Islands: Fox Island (a.k.a. Pine Island), Storms Island, Chapel Island