Dewar 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 lies on 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 far side. Less than one crater diameter to the south-southwest is the crater Stratton

Stratton (crater)

Stratton is a lunar impact crater on the Moon's far side. It is located to the north of the large craters Keeler and Heaviside, and less than one crater diameter to the south of Dewar....

. Vening Meinesz

Vening Meinesz (crater)

Vening Meinesz is a lunar crater on the far side of the Moon. The northern inner wall of this crater lies along the lunar equator. To the north of this formation is the larger crater Mandel'shtam, and slightly farther to the south is the larger Keeler...

is a little over one crater diameter to the northwest. The slightly worn rim of this crater is roughly circular, with a small outward protrusion along the southern edge. The interior floor is marked by several small impacts along the eastern side.

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 Dewar.

Dewar	Latitude	Longitude	Diameter
E	2.3° S	167.8° E	15 km
F	2.8° S	167.5° E	14 km
S	3.1° S	163.9° E	23 km