The surface of the Moon has many features, including mountains and valleys, craters, and maria—wide flat areas that look like seas from a distance but are probably solidified molten rock.
[1] Riccioli's map of the Moon was drawn by Francesco Maria Grimaldi, who has a crater named after him.
Other former maria include: A related set of features are the Lunar lacus (singular lacus, Latin for "lake"), which are smaller basaltic plains of similar origin: A related set of features are the sinus (singular sinus, Latin for "bay") and paludes (singular palus, Latin for "marsh"): Some sources also list a Palus Nebularum ("Marsh of Mists") at 38.0° N, 1.0° E, but the designation for this feature has not been officially recognized by the IAU.
The crater nomenclature is governed by the International Astronomical Union, and this list only includes features that are officially recognized by that scientific society.
Clementine data show a range of about 18,100 meters from lowest to highest point on the Moon.
The highest point, located on the far side of the Moon, is approximately 6500 meters higher than Mons Huygens (usually listed as the tallest mountain).
A dorsum (plural dorsa, meaning back or ridge) is a wrinkle-ridge system commonly found on lunar maria.
However these names for the highland regions are no longer used on recent maps, and Terrae are not officially recognized as standard lunar nomenclature by the International Astronomical Union.