Chacaltaya is a mountain in the Cordillera Real, one of the mountain ranges of the Cordillera Oriental, itself a range of the Bolivian Andes. Its elevation is 5,421 meters .
Chacaltaya's glacier , which was as old as 18,000 years, had an area of 0.22 km² in 1940, which had been reduced to 0.01 km² in 2007 and was completely gone by 2009. Half of the meltdown, as measured by volume, took place before 1980. The final meltdown after 1980, due to missing precipitation and the warm phase of El Niño, resulted in the glacier's disappearance in 2009.The glacier was one of the highest in South America, located about 30 kilometers from La Paz, near the Huayna Potosí mountain.