Lacus Oblivionis (Latin oblīviōnis, "Lake of Forgetfulness") is a small lunar mare on the surface of the Moon. It is located on the far side of the Moon at 21.0° S, 168.0° W and is 50 km in diameter. The name was adopted by the IAU in 1976.Lacus Oblivionis, Feature 3213, Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)
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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