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Emerald Lake in Yoho National Park in the Canadian Rockies.

The emerald (actually, turquoise) colour is actually due to what's called rock flour (mainly quartz and feldspar), from glacial erosion.

Emerald Lake being relatively small, is one of the first lakes in the Banff area to become free of ice. Certainly, when this photo was taken in May 2002, Lake Louise (just down the road) was still 95% solid ice.

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