Lacus Oblivionis (Moon)
"Lake of Forgetfulness"
Lacus Oblivionis is a small lunar mare on the surface. The name was adopted by the IAU in 1976. The crater Mohorovičić R lies to the southwest. (wikipedia entry)
A lacus is a "lake" or small plain. On the Moon they are named after latin terms describing weather and other abstract concepts.
Lacus Oblivionis
-20.39° N 191.48° E