Aguas Calientes Volcano or Cerro Aguas Calientes, also called Simbad, is a cone-shaped stratovolcano

Stratovolcano

A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...

 located 5 kilometres (3 mi) east of the Lascar

Lascar Volcano

-Geographical setting:Lascar is located in the altiplano of the Antofagasta Region of northern Chile, east of the Salar de Atacama, immediately west of the Aguas Calientes volcano, and to the northeast of Laguna Lejía...

 volcano and directly north of Laguna Lejía

Laguna Lejía

Laguna Lejía is a salt lake located in the Altiplano of the Antofagasta Region of northern Chile. The landscape of the area is dominated by the volcanoes Chiliques, Lascar, Aguas Calientes and Acamarachi....

, in Chile's II Region (Antofagasta

Antofagasta Region

The II Antofagasta Region is one of Chile's fifteen first-order administrative divisions. It comprises three provinces, Antofagasta, El Loa and Tocopilla...

). Also in the area are the volcanoes Acamarachi

Acamarachi

Acamarachi, also known as Pili, is a stratovolcano located northeast of the volcanoes Aguas Calientes and Lascar, and southwest of the sector Salar de Pujsa of Los Flamencos National Reserve, in the Antofagasta Region of Chile. The volcano lies on a high plateau called Puna de Atacama.It has a...

 and Chiliques

Chiliques

Chiliques is a stratovolcano located in the Antofagasta Region of Chile, immediately north of Cerro Miscanti. Laguna Lejía lies to the north of the volcano.The volcano, which has been dormant for at least 10,000 years, is now showing signs of life...

.

A small 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...

is found within the Aguas Calientes summit crater, making it one of the highest lakes in the world. The crater lake is tinged red, due to the presence of large populations of microorganisms.