The blue, glacier-fed waters of the Kasilof River, Alaska, USA

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Born of glaciers. The blue, glacier-fed waters of the Kasilof River, Alaska

Seen from above, the Kasilof River winds like a ribbon of turquoise through Alaska's Kenai Peninsula. The vivid blue water comes from glacial silt carried downstream from Tustumena Lake, one of the largest freshwater lakes in the state. Flowing about 17 miles before emptying into Cook Inlet, the river is shorter than its famous neighbor, the Kenai, but no less remarkable.

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