The Vilama caldera is between and wide. Younger volcanic rocks have almost entirely obscured its margins, with the exception of a high escarpment on the western side of the caldera. The caldera contains a large resurgent dome surrounded by a deep moat. This moat, which is missing on the eastern side of the caldera, contains several lakes such as Laguna Chojllas, Laguna Coruto and Laguna de Vilama, the last of which gives the caldera its name. Several younger volcanic centres are found around the caldera and may be located above its margin, such as the Khastor domes and stratovolcano, the Cerro Alcoak and Cerro Salle volcanoes, the Cerros Conventos-Niño-Coyamboy chain, Vitichi and Cerro Bayo domes and the Vilama stratovolcano. These edifices are mostly dacitic centres that are considered to be the expression of post-collapse volcanism at the Vilama system.