Central Island in the middle of Lake Turkana, also known as Crocodile Island, is composed of more than a dozen craters and cones, three of which are filled by small lakes. The two largest lakes partially fill craters up to 1 km wide and about 80 m deep. An E-W chain of small explosion craters cuts the E side of the 3-km-wide island. Several small islands to the SE represent partially submerged crater rims, and other cones and lava plugs lie beneath the lake surface near the island. The youngest tuffs and lavas may be as young as Holocene (Karson and Curtis, 1992). Fumarolic activity is concentrated along the NE-to-SE rim of the central crater, and sprays of sulfur from the fumaroles were observed by visitors in the 1930s. In 1974 intense emission of molten sulfur and steam clouds were seen from the mainland.