Kasilof River, Alaska, United States 29 Sept 2026

Seen from above, the Kasilof River winds like a ribbon of turquoise through Alaska"s Kenai Peninsula in the United States. 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 neighbour, the Kenai, but no less remarkable.

© jared lloyd/Getty Images

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