Even more surprising is where the lake is located. Though your first guess might be somewhere like Panama or Nicaragua, this lake is located in the heart of the landlocked United States- Wyoming.
It’s called Isa Lake, and is located in Yellowstone National Park. The lake sits along the continental divide at Craig Pass, and was named after Isabel Jelke. It’s believed not only to be the only lake to drain into the Pacific and Atlantic Oceans, but to be the only lake in the world that drains into two different oceans backwards.
The east side drains through the Lewis River into the Pacific Ocean, while the west side drains through Firehole River to the Atlantic Ocean. Considering it's location, that's nothing short of an impressive feat.