Lacus Oblivionis (Latin oblīviōnis, "Lake of Forgetfulness") is a small lunar mare on the surface of the Moon.

It is located at 21.0° S, 168.0° W and is 50 km in diameter.

The name was adopted by the IAU in 1976.

[1] The crater Mohorovičić R (satellite of Mohorovičić) lies to the northeast, and the crater Sniadecki Y (satellite of Sniadecki) lies to the southwest.

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