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More than 80% of all glacial ice in the northern Andes is concentrated on the highest peaks in small plains of approximately 1 km 2 (0.39 sq mi) in size. A 1992 to 1998 observation of the Chacaltaya Glacier in Bolivia and Antizana Glacier in Ecuador indicate that between 0.6 m (2.0 ft) and 1.9 m (6.2 ft) of ice was lost per year on each glacier.