Mount Lolmalasin, standing at approximately 3,700 meters (12,080 feet), is the highest crater mountain in the Ngorongoro Conservation Area and ranks as the third tallest peak in Tanzania. Located entirely within Nainokanoka ward, near the Olmoti Crater and en route to Empakaai Crater, it is part of the Crater Highlands. This extinct volcano, which last erupted during the Pleistocene epoch, is notable for being the source of the Simiyu River, which flows westward to Lake Victoria.