Totoket Mountain, with a high point of (est.) 720 feet (220 m) above sea level, is a traprock massif with several distinct summits, located 7 miles (11 km) northeast of New Haven, Connecticut. It is part of the Metacomet Ridge that extends from the Long Island Sound near New Haven, north through the Connecticut River Valley of Massachusetts to the Vermont border. Totoket Mountain is known for its 500 feet (150 m) high scenic cliffs, unique microclimate ecosystems, rare plant communities, and for Lake Gaillard, a 2.5-mile (4.0 km) wide public reservoir nearly enclosed by the mountain. The north ridge of Totoket Mountain is traversed by the 50-mile (80 km) Mattabesett Trail and a significant network of shorter trails.