Mentolat is an ice-filled 6 km (4 mi) wide caldera

Caldera

A caldera is a cauldron-like volcanic feature usually formed by the collapse of land following a volcanic eruption, such as the one at Yellowstone National Park in the US. They are sometimes confused with volcanic craters...

 in the central portion of Magdalena Island

Magdalena Island, Aisén Region

Magdalena Island is an island in Aisén Region of southern Chile. It has an approximate area of 2,025 km2. The island is located between the Moraleda Channel and the Puyuhuapi Channel, and belongs partially to the Isla Magdalena National Park....

, Aisén Province

Aisén Province

Aisén Province is one of four provinces of the Chilean region of Aisen . Its capital is Puerto Aisén.-Demographics:The province had a 2002 population of 23,498 according to the census by the National Statistics Institute. Of these, 16,180 lived in urban areas and 13,451 in rural areas. Between...

, Chilean Patagonia

Patagonia

Patagonia is a region located in Argentina and Chile, integrating the southernmost section of the Andes mountains to the southwest towards the Pacific ocean and from the east of the cordillera to the valleys it follows south through Colorado River towards Carmen de Patagones in the Atlantic Ocean...

. It forms part of the Isla Magdalena National Park

Isla Magdalena National Park

The Isla Magdalena national park is a protected area in Magdalena Island, Patagonia, Chile. It was created in 1967 as Forest Reserve and was reclassified as a National Park in 1983....

. Little is known of the eruptive history of Mentolat, but it is thought to be young, with a possible eruption in the early 1700's. On the infrequent occasions when the clouds clear, Mentolat

Mentolat

Mentolat is an ice-filled wide caldera in the central portion of Magdalena Island, Aisén Province, Chilean Patagonia. It forms part of the Isla Magdalena National Park. Little is known of the eruptive history of Mentolat, but it is thought to be young, with a possible eruption in the early 1700's...

 overlooks the port town of Puerto Cisnes

Puerto Cisnes

Puerto Cisnes is a town and seaport in Cisnes commune, Aisén Province, Aisén Region in the Chilean Patagonia. The town is located at the outflow of Cisnes River....

.