Washington Rock State Park is a 52-acre (210,000 m2) scenic state park on top the first Watchung Mountain in Green Brook Township, New Jersey. The park is operated and maintained by the New Jersey Division of Parks and Forestry.
It is famous for the scenic overlook which was already taken advantage of by General George Washington in 1777 to monitor British troop movements when the Continental Army was stationed at the Middlebrook encampment. The 30-mile (48 km) panoramic vista covers the eastern plains of New Jersey up to New York City.
The land was bought in 1913 to establish the park. Most of it is woodland but at the outlook there are walking trails and a picnic area.(Wikipedia)