Isa Lake

Infobox_lake
lake_name = Isa Lake
image_lake = Isalake.jpg
caption_lake = Isa Lake
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location = Yellowstone National Park, Wyoming
coords = coord|44|26|27|N|110|43|09|W|type:waterbody_region:US-WY|display=inline,title
type = Natural lake
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basin_countries = United States
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Isa Lake is located in Yellowstone National Park, in the U. S. state of Wyoming. [cite web| title =Craig Pass, USGS Craig Pass (WY) Topo Map| work =| publisher =TopoQuest USGS Quads| date =| url =http://www.topoquest.com/map.asp?lat=44.44083&lon=-110.71833&datum=nad27&u=4&layer=DRG&size=l&s=50| format =Map| accessdate = 2008-06-29] 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 Isabel Jelke, though it is not clear why.cite web | last = | first = | authorlink = | coauthors = | year = | url =http://www.nps.gov/yell/planyourvisit/ngrant.htm | title = Isa Lake| format = | work = Grant Village Area Natural Highlights | publisher = National Park Service| accessdate = 2007-08-19]

Isa Lake is believed to be the only lake in the world which drains to two different oceans "backwards". 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 Atlantic Ocean. [cite web | last = | first = | authorlink = | coauthors = | year = | url =http://www.wyomingtourism.org/cms/d/west_thumb_area.php | title = Isa Lake| format = | work = | publisher = Wyomingtourism.org| accessdate = 2007-08-19] This is the opposite of what one would expect since the Atlantic Ocean is east of the lake and the Pacific Ocean is to the west.

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 know as the "lower loop" of the figure-eight roadway which traverses through Yellowstone.

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*Gnis|1589979