The Crim lies on the western fringe of the Isles of Scilly being the most westward of the Western Rocks. They are approximately 1.5 miles (2.4 km) north of Bishop Rock, and about 0.25 miles (0.40 km) southwest of Zantman's Rock. The name may be cognate with the Middle Welsh "crimp" meaning "shin, ridge, or ledge." The most conspicuous of the Crim Rocks is the Peaked Rock. At least thirty ships are known to have been wrecked on the Crims.