Ross 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 northwest part of the Mare Tranquillitatis

Mare Tranquillitatis

Mare Tranquillitatis is a lunar mare that sits within the Tranquillitatis basin on the Moon. The mare material within the basin consists of basalt formed in the intermediate to young age group of the Upper Imbrian epoch. The surrounding mountains are thought to be of the Lower Imbrian epoch, but...

. It lies south-southwest of the crater Plinius

Plinius (crater)

Plinius is a prominent lunar impact crater on the border between Mare Serenitatis to the north and Mare Tranquilitatis to the south. South-southeast of Plinius is the crater Ross, and to the northeast is Dawes. Just to the north is a system of rilles named the Rimae Plinius...

, and northwest of 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 Maclear

Maclear (crater)

Macleer is a lava-flooded crater on the northwest part of the Mare Tranquillitatis, a lunar mare in the eastern half of the Moon. The crater is located to the southeast of the slightly larger Ross...

.

This crater has a generally circular shape, but is not quite symmetrical. The inner walls slope down to a base of slumped material, before joining a relatively level interior floor. There is a low ridge to the west of the crater mid-point.

This should not be confused with the similarly named crater Rosse

Rosse (crater)

Rosse is a bowl-shaped lunar impact crater located in the southern part of Mare Nectaris. To the southwest is the large, flooded crater Fracastorius....

, which is located farther to the northeast.

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 Ross.

Ross	Latitude	Longitude	Diameter
B	11.4° N	20.2° E	6 km
C	11.7° N	19.0° E	5 km
D	12.6° N	23.3° E	9 km
E	11.1° N	23.4° E	4 km
F	10.9° N	24.2° E	5 km
G	10.7° N	24.9° E	5 km
H	10.2° N	21.8° E	5 km