Lake Vanda is a perennially frozen lake, which occupies an undreained bedrock basin in the Wright Valley, south Victoria Land. Elevated beaches, deltas, and lacustrine cliffs prove that it was once approximately 185ft higher. The size and excellent development of these features prove that they were formed when Lake Vanda was assentially open for at least a part of the year. It is unlikely that the climate was warm enough when these elevations features were being formed to have kept the lake essentially open at any season of the year The recent discovery of lake temperatures higher than 70 degrees F in Lake Vanda and the presence of small cinder cones in the Wright Valley indicate that the open water necessary for the formation of the elevated beaches, deltas, and cliffs resulted from volcanic heating of the lake.