What are 4 geographical features of Colombia?

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Lake: There is an unnamed crater lake on Ojos del Salado (which itself is the world's highest volcano) at 6,390 m (20,965 ft), on the Argentina–Chile border (the lake is in Chile). Another candidate is Lhagba Pool on the northeast slopes of Mount Everest, Tibet at an altitude of 6,368 m (20,892 ft).
Navigable Lake: Lake Titicaca, on the border of Peru and Bolivia in the Andes, 3,812 m (12,507 ft)
Glacier: The Khumbu Glacier on the southwest slopes of Mount Everest in Nepal is the world's highest glacier, beginning on the west side of Lhotse at an altitude of 7,600 m (24,934 ft) to 8,000 m (26,247 ft).
River: One candidate from among many possibilities is the Ating Ho (Ho meaning river), which flows into the Aong Tso (Hagung Tso), a large lake in Tibet and is about 6,100 m (20,013 ft) at its source at 32°49′30″N 81°03′45″E. A very large high river is the Yarlung Tsangpo or upper Brahmaputra River in Tibet, whose main stem, the Maquan He has its source at about 6,020 m (19,751 ft) above sea level at 30°48′59″N 82°42′45″E.Above these altitudes there are no rivers since the temperature is almost always below freezing.
Island: There are a number of islands in the Orba Co lake, which is located at an altitude of 5,209 m (17,090 ft) in Tibet.