Llullaillaco is a stratovolcano located on the border between Chile and Argentina. It stands at an elevation of 6,739 meters (22,110 feet), making it one of the highest active volcanoes in the world. The volcano is part of the Andes mountain range and is known for its arid environment and unique geological features. The summit of Llullaillaco is famous for the discovery of three Inca mummies in 1999, known as the Llullaillaco mummies. These mummies were found at an altitude of 6,732 meters (22,110 feet) and are believed to have been part of a ritual sacrifice. The site has provided valuable insights into Inca culture and their practices related to religion and sacrifice.