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The Nakimu Caves are a cave system located in Glacier National Park in British Columbia, Canada. The caves run for six kilometres in the central region of the park. The name means "grumbling spirits" in the Shuswap language. They were formed by the action of Cougar Brook on a soluble limestone strata. The access is through Balu Pass. The caves consist of marbloid rocks from the Cambrian period, many of which exhibit scalloping patterns. The cave contains cauliflower-shaped agglomerations of a substance called moonmilk; this is a precipitate of calcium carbonate and bacteria.