Lacus Solitudinis (Moon)

"Lake of Solitude"

Lacus Solitudinis is a small lunar mare on the far side. The eastern edge is continuous, while the west is more irregular and disrupted by small craters. To the northwest of the northern end is the small crater Bowditch, a lava-flooded feature although it does not appear directly connected to the Lacus Solitudinis. (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.