Tripod Rock is a balancing rock, or perched boulder, located in Kinnelon, New Jersey in the Pyramid Mountain Natural Historic Area. This multi-ton Precambrian gneiss boulder, located near the edge of a long ridge, is balanced on three smaller boulders. Tripod Rock is roughly 6 m (20 ft) long, 3 m (9.8 ft) wide, and 2.5 m (8 ft 2 in) high, weighing approximately 127 tonnes (280,000 lb). A triangular crest runs the length of its top. The boulder is balanced on three smaller stones roughly 1 m (3 ft 3 in) in diameter that raise it above the bedrock by about 0.5 m (1 ft 8 in) at its lowest point. The point of contact between the boulder and its support stones forms an approximate 3-4-5 triangle.