Webb is a small 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 near the eastern edge of the Mare Fecunditatis

Mare Fecunditatis

Mare Fecunditatis is a lunar mare which is 840 km in diameter. The Fecuditatis basin formed in the Pre-Nectarian epoch, while the basin material surrounding the mare is of the...

, in the eastern 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...

 near the equator. It is to the north of the prominent crater Langrenus

Langrenus (crater)

Langrenus is a prominent impact crater located near the eastern lunar limb. The feature is circular in shape, but appears oblong due to foreshortening. It lies on the eastern shore of the Mare Fecunditatis...

, and west of Maclaurin

Maclaurin (crater)

Maclaurin is a lunar impact crater that is located in the eastern part of the Moon's near side. It lies just to the southeast of the small Mare Spumans, and to the northeast of the prominent crater Langrenus. To the east-southeast is Gilbert....

.

The interior of Webb is relatively dark compared with the inner walls of the rim, and it has a low hill at the mid-point of the interior. On 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...

 to the north is a faint marking of a ray system

Ray system

A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by...

 that appears to radiate from this crater.

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 Webb.

Webb	Latitude	Longitude	Diameter
B	0.8° S	58.4° E	6 km
C	0.3° N	63.8° E	34 km
D	2.3° S	57.6° E	7 km
E	1.0° N	61.1° E	7 km
F	1.5° N	61.0° E	9 km
G	1.7° N	61.2° E	9 km
H	2.1° S	59.5° E	10 km
J	0.6° S	64.0° E	24 km
K	0.7° S	62.9° E	21 km
L	0.1° N	62.7° E	7 km
M	0.2° S	63.8° E	5 km
N	0.3° S	63.6° E	4 km
P	2.3° S	57.8° E	36 km
Q	1.0° S	61.2° E	5 km
U	1.8° N	56.3° E	6 km
W	3.0° N	58.2° E	8 km
X	3.2° N	58.3° E	8 km

The following craters have been renamed by the IAU

International Astronomical Union

The International Astronomical Union IAU is a collection of professional astronomers, at the Ph.D. level and beyond, active in professional research and education in astronomy...

.

• Webb R — See Condon (crater)
  Condon (crater)
  Condon is a lunar crater that lies on the eastern shore of the Sinus Successus, a bay along the northeast edge of Mare Fecunditatis. It lies midway between the larger crater Apollonius to the north and the smaller Webb to the south on the Mare Fecunditatis...
  
  .