Riccius 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...

 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 in the rugged, southeastern part of the Moon

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...

's near side. It lies within one crater diameter southeast of the crater Rabbi Levi

Rabbi Levi (crater)

Rabbi Levi is a lunar impact crater that is located among the rugged highlands in the southeastern part of the Moon's near side. Several notable craters are located nearby, including Zagut just to the north-northwest, the heavily impacted Riccius to the southeast, and Lindenau to the northeast next...

. To the east-northeast is Stiborius

Stiborius (crater)

Stiborius is a lunar impact crater that lies to the south-southwest of the crater Piccolomini, in the southeastern quadrant of the Moon's near side. To the south-southwest of Stiborius is the smaller Wöhler. Stiborius is 44 kilometers in diameter and 3.7 kilometers deep.The rim of this crater is...

 and due south is Nicolai

Nicolai (crater)

Nicolai is a lunar crater that is located in the southern hemisphere of the Moon, in a region that is less disturbed by significant impacts than most of the highlands. The nearest craters of note are Spallanzani to the south, and the much larger Maurolycus and Barocius to the east. The crater is...

.

This formation has been so heavily bombarded by subsequent impacts that it is nearly unrecognizable as a crater. Only the western and southwestern parts of the rim remains intact, the remainder having been completely obliterated by small craters. These craters also occupy parts of the northern and southern floor. Only a section in the northeast and near the intact western rim remain unmarked. This is perhaps the most defaced crater formation on the Moon that possesses an eponym

Eponym

An eponym is the name of a person or thing, whether real or fictitious, after which a particular place, tribe, era, discovery, or other item is named or thought to be named...

.

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 Riccius.

Riccius	Latitude	Longitude	Diameter
A	35.9° S	27.4° E	24 km
B	37.5° S	27.8° E	19 km
C	36.2° S	28.8° E	24 km
D	40.3° S	28.9° E	17 km
E	39.9° S	26.4° E	22 km
G	38.5° S	24.4° E	13 km
H	35.4° S	26.1° E	20 km
J	40.7° S	26.0° E	13 km
K	39.1° S	25.7° E	6 km
L	41.5° S	26.8° E	8 km
M	37.8° S	26.4° E	14 km
N	41.1° S	27.6° E	13 km
O	36.2° S	27.8° E	9 km
P	35.7° S	28.1° E	11 km
R	41.4° S	30.7° E	7 km
S	37.0° S	26.5° E	11 km
T	36.3° S	25.0° E	7 km
W	38.9° S	25.2° E	19 km
X	38.8° S	26.7° E	11 km
Y	35.8° S	29.1° E	10 km