Zantman's Rock is located 34 miles (55 km) to the west of Land's End, Cornwall, and 6 miles (9.7 km) west from the Isles of Scilly. Viewed from a distance, it is barely visible on the surface of the waters. It is 2 miles (3.2 km) north of Bishop Rock Lighthouse, and about 0.25 miles (0.40 km) northeast of the Crim Rocks.
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The name "Zantman's Rock" is recorded on an Admiralty chart of 1860: before then, it appears not to have been distinguished from the Crim Rocks a short distance to the southwest. Several legends attempt to explain the name of the rock, one of which involves a Dutchman being shipwrecked and finding himself in the unlikely position of clinging on to the rock.
Zantman's Rock has been the cause of at least one famous shipwreck: that of the Susanna, on 14 August 1913. The wreckage still lies on the southwestern side of Zantman's Rock.