Monument Mountain is a 2.5-mile (4.0 km) long quartzite ridgeline located in Great Barrington and Stockbridge, Massachusetts in the Berkshires geology. Beside the high point, 1,739 feet (530 m), the mountain has several other distinct peaks, most notably the open, knife-edge Squaw Peak, 1,642 feet (500 m) located on the southeast side of the mountain within the 503-acre (204 ha) Monument Mountain reservation managed by The Trustees of Reservations. The mountain receives over 20,000 visitors per year.