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52°04′38″N 117°12′48″W / 52.07718°N 117.21322°W
Castleguard Cave is a limestone cave located at the north end of Banff National Park in the Rocky Mountains of Alberta, Canada. With 20,357 metres (66,788 ft) of surveyed passages (as of 2007), it is Canada's longest cave, and its fifth deepest at 384 metres (1,260 ft). Castleguard Cave ascends gently from its entrance and terminates beneath the Columbia Icefield.