Lacus Excellentiae (Moon)

"Lake of Excellence"

Lacus Excellentiae is a small, irregular lunar mare in the southern latitudes , amidst the rugged terrain to the south of the larger Mare Humorum. The name of this lunar lake is a recent addition to lunar nomenclature, being officially approved in 1976 by the IAU General Assembly. The Lacus Excellentiae was the impact site of the SMART-1 lunar orbiter. (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.