Lacus on The Moon
21 named features carry the IAU descriptor Lacus — a small dark plain on The Moon, out of 114 in the mapped Solar System.
Named
21
of 2,023 named places on The Moon — 1.0%
Largest
425 km
Lacus Somniorum
Median size
98.5 km
Across the 21 with a measured diameter
Named between
1935–2025
IAU approval dates
How lacus on The Moon get their names
The IAU assigns each feature class on each world a naming theme. Across the 21 lacus with a recorded origin, one category covers them all, led by Latin.
Latin21
All 21 lacus on The Moon
Every one has its own page, on the surface it sits on.
Lacus Somniorum425 kmLacus Veris383 kmLacus Temporis205 kmLacus Excellentiae198 kmLacus Autumni196 kmLacus Mortis159 kmLacus Timoris154 kmLacus Solitudinis123 kmLacus Bonitatis122 kmLacus Doloris103 kmLacus Felicitatis98.5 kmLacus Gaudii88.5 kmLacus Aestatis86.4 kmLacus Tenebrarum85 kmLacus Lenitatis78.3 kmLacus Spei76.7 kmLacus Odii72.7 kmLacus Perseverantiae70.6 kmLacus Luxuriae50.6 kmLacus Oblivionis49 kmLacus Hiemalis48 km
Lacus elsewhere in the Solar System
The same descriptor is used on 1 other world, for 93 more features.