Castleguard Cave
(重定向自Castleguard)


Castleguard Cave is a limestone cave located at the north end of Banff National Park in the Rocky Mountains of Alberta, Canada. With 20,357m of surveyed passages (as of 2007), it is Canada's longest cave, and its fifth deepest at 384m. Castleguard Cave ascends gently from its entrance and terminates beneath the Columbia Icefield.