Saltonstall Mountain, also known as Saltonstall Ridge, with a high point of (est.) 320 feet (98 m) above sea level, is a traprock mountain ridge located 3 miles (5 km) east of New Haven, Connecticut and 1.75 miles (2.8 km) north of Long Island Sound. It is part of the Metacomet Ridge that extends from Long Island Sound near New Haven, Connecticut, north through the Connecticut River Valley of Massachusetts to the Vermont border. Saltonstall Mountain is known for its 100 foot (30 m) scenic cliff faces and sharp ridgeline, unique microclimate ecosystems, rare plant communities, and for Lake Saltonstall, a 3 miles (5 km) long by 0.3 miles (400 m) wide municipal reservoir nearly enclosed by the mountain.