C. Mayer is a lunar

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 impact crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 that is located at the northern edge of the Mare Frigoris

Mare Frigoris

Mare Frigoris is a lunar mare located just north of Mare Imbrium, and stretches east to north of Mare Serenitatis. The mare is in the outer rings of the Procellarum basin...

, due north of the prominent crater Aristoteles

Aristoteles (crater)

Aristoteles is a lunar impact crater that lies near the southern edge of the Mare Frigoris and to the east of the Montes Alpes mountain range. To the south of Aristoteles lies the slightly smaller crater Eudoxus and these two form a distinctive pair for a telescope observer. An arc of mountains...

. Also to the south, but only a third as distant, is the smaller crater Sheepshanks

Sheepshanks (crater)

Sheepshanks is a small lunar crater located near the northern edge of Mare Frigoris. Due south on the opposite shore is the prominent crater Aristoteles while to the north is C. Mayer. Sheepshanks appears somewhat oblong due to foreshortening, but it is actually nearly circular. The inner walls...

. Due east of C. Mayer is the flooded crater Kane

Kane (crater)

Kane is the walled remains of a lunar crater that has been flooded by lava from Mare Frigoris to the south, and it lies on the northeast edge of this mare. The crater lies midway between the craters C. Mayer to the west and Democritus in the east...

.

C. Mayer is a relatively young formation, with a sharp-edged and well-defined outer rim. The rim is not quite circular, and appears somewhat polygon

Polygon

In geometry a polygon is a flat shape consisting of straight lines that are joined to form a closed chain orcircuit.A polygon is traditionally a plane figure that is bounded by a closed path, composed of a finite sequence of straight line segments...

al-shaped with outward bulges along the edge, most notably to the west. The inner walls have a terrace system and the interior is somewhat rough and irregular. The central peak lies just to the north of the mid-point, and extends in a northerly direction.

The lava

Lava

Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at...

-flooded formation C. Mayer D is attached to the southeastern rim of the crater, and a gap in the southeastern rim joins it to the Mare Frigoris. Thus the lunar mare

Lunar mare

The lunar maria are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. They were dubbed maria, Latin for "seas", by early astronomers who mistook them for actual seas. They are less reflective than the "highlands" as a result of their iron-rich compositions, and...

 extends up to the outer rampart of C. Mayer.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to C. Mayer.

C. Mayer	Latitude	Longitude	Diameter
B	60.2° N	15.6° E	36 km
D	62.1° N	18.6° E	66 km
E	61.1° N	16.0° E	12 km
F	62.0° N	19.5° E	7 km
H	64.1° N	14.7° E	43 km