West (lunar crater)
West crater is a small crater in Mare Tranquillitatis on the moon, east of the Apollo 11 landing site, which is known as Tranquility Base. The name of the crater was formally adopted by the IAU in 1973.
The Apollo 11 astronauts Neil Armstrong and Buzz Aldrin landed the Lunar Module (LM) Eagle approximately 550 meters west of West crater on July 20, 1969. During the descent, West crater was a major landmark. The boulder field that Armstrong saw a need to avoid during the descent was the ejecta of West crater.