Totoket Mountain is a steep traprock ridge in south-central Connecticut, part of the Metacomet Ridge northeast of New Haven. Extending about 11.5 miles, it reaches 720 feet at Bluff Head and includes dramatic basalt cliffs, divided southern arms around Lake Gaillard, and neighboring heights such as Sea Hill and the Sugarloaf Hills. Formed roughly 200 million years ago through volcanic activity, faulting, erosion, glaciation, and uplift, the ridge supports varied microclimates, rare plant communities, and important raptor habitat. Much of the mountain is protected as public watershed land, with trail access and recreation shaped by conservation needs and ongoing concerns over suburban growth and quarrying.