Lago Licancabur is a crater lake

Crater lake

A crater lake is a lake that forms in a volcanic crater or caldera, such as a maar; less commonly and with lower association to the term a lake may form in an impact crater caused by a meteorite. Sometimes lakes which form inside calderas are called caldera lakes, but often this distinction is not...

 in Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

 located in the Licancabur

Licancabur

Licancabur is a highly symmetrical stratovolcano on the southernmost part of the border between Chile and Bolivia. It is located just southwest of Laguna Verde in Bolivia. The volcano dominates the landscape of the Salar de Atacama area...

 volcano in the Antofagasta region, of the Región de Antofagasta, Province of El Loa and close to San Pedro de Atacama

San Pedro de Atacama

San Pedro de Atacama is a Chilean town and commune in El Loa Province, Antofagasta Region. It is located east of Antofagasta, some 106 km southeast of Calama and the Chuquicamata copper mine, overlooking the Licancabur volcano. It features a significant archeological museum, the R. P...

 as well as very close to the border of Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

 with Bolivia

Bolivia

Bolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...

. It is believed to be one of the highest lakes in the world at an elevation of 5916m.

While the volcano marks the limits of Chile with Bolivia, the lake is entirely located within the Chilean part of the volcano, since only the lower two thirds of the Northeastern slope of the volcano belong to Bolivia; 5400 m (17,717 ft) from the foot of the slope at 4360 m (14,304 ft); and the international borders are located slightly over 1 kilometer to the northeast from the lake.
While undertaking archaeological research on the summit in 1981, Dr. Johan Reinhard free dove the lake and then returned in 1982 with Dr Charles Brush and three other divers and scuba dived

Scuba diving

Scuba diving is a form of underwater diving in which a diver uses a scuba set to breathe underwater....

 in the lake, setting an unofficial world record for the highest ever altitude dive

Altitude diving

Altitude diving is scuba diving where the surface is 300 meters or more above sea level . The U.S. Navy tables recommend that no alteration be made for dives at altitudes lower than 91 meters and dives between 91 meters and 300 meters correction is required for dives over 44 meters sea water...

.

The volcanic crater lake is 100 meters long by 70 meters and has a depth of 8 meters..