Geological Chronicle
Flag crater is a small crater in the Descartes Highlands of the Moon, measuring approximately 240 meters in diameter and over 20 meters deep. Situated between the prominent North Ray and South Ray craters, the impact cuts into the Cayley Formation of Imbrian age.
On April 21, 1972, the Apollo 16 Lunar Module Orion landed about 1.5 kilometers east of Flag. Astronauts John Young and Charles Duke explored the area over three EVAs using a Lunar Roving Vehicle, driving to Flag on EVA 1. Geology Station 1 was established adjacent to Flag at the much smaller Plum crater, where samples were collected.
The name of the crater was formally adopted by the IAU in 1973. The slightly larger crater Spook, also visited by the astronauts, lies less than 1 kilometer to the east.