Sail Rock is a rock lying 1 nautical mile (1.9 km; 1.2 mi) northwest of Shag Island and 7 nautical miles (13 km; 8.1 mi) north of Heard Island. This rock, though positioned several miles too far westward, appears to have been first shown on an 1860 sketch map compiled by Captain H.C. Chester, American sealer operating in the area during this period.