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Isa Lake
Isa Lake YNP1.jpg
Isa Lake
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Location Yellowstone National Park, Teton County, Wyoming, US
Coordinates 44°26′27″N 110°43′09″W / 44.44083°N 110.71917°W / 44.44083; -110.71917
Type Natural lake
Primary outflows Firehole River (west) (spring only)
Lewis River (east) (spring and early summer)
Basin countries United States
Surface elevation 8,262 feet (2,518 m)

Isa Lake is located in Yellowstone National Park, in the U.S. state of Wyoming. The lake straddles the continental divide at Craig Pass and was first discovered in 1891 by Hiram M. Chittenden, who was exploring the best routes for a road to connect Old Faithful and West Thumb geyser basins. Chittenden named the lake after Miss Isabel Jelke, from Cincinnati, though it is not clear why.

Continental Divide sign at Two-Ocean Lake
Map of Continental Divide at Isa Lake

Isa Lake is believed to be one of the few natural lakes in the world which drain to two different oceans, another being Wollaston Lake. (For similar cases see List of unusual drainage systems.) The east side of the lake drains by way of the Lewis River to the Pacific Ocean and the west side of the lake drains by way of the Firehole River to the Gulf of Mexico.

The lake is easy to visit as it is adjacent to the road that now connects the Old Faithful and West Thumb geysers basins, on what is known as the "lower loop" of the figure-eight roadway which traverses through Yellowstone. The great yellow pond-lily (nuphar polysepalum) thrives in the lake.

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