Sherrard Island is part of the Great Barrier Reef Marine Park north-west of Cape Melville, Queensland and north-east of Coen between the first three-mile (4.8 km) opening and the second three-mile (4.8 km) opening of the Barrier Reef about 100 km (62 mi) south-east of Lockhart River in the Osborn Channel.The island is 10 km (6.2 mi) east of Old Lockhart River and 30 km (19 mi) south of Cape Direction.