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The Eduardo Avaroa Andean Fauna National Reserve (REA) is located in the province of Sur Lípez, in the extreme southwest of Bolivia. Covering an area of 714,745 hectares between 4,200 m and 5,400 m altitude, it is the most visited protected area in the country. Founded in 1973, it is named after the 19th century Bolivian war hero Eduardo Avaroa. The reserve is home to the Laguna Colorada National Wildlife Sanctuary and protects birds, including three endemic species of flamingo. Notable features include volcanoes, hot springs, geysers, and lakes such as Laguna Colorada. Another attraction is the Stone Tree, an isolated rock formation in the Siloli dunes. The climate varies, with dry winters and summers with little rain, recording average temperatures of 3 °C.