Cartier Island

Cartier Island is an uninhabited and unvegetated sand cay in a platform reef in the Timor Sea, north of Australia and south of Indonesia. It is within the Territory of Ashmore and Cartier Islands, an external territory of Australia. The land area of Cartier Island is about 0.4 hectares (1.0 acre).^[1] It is located at 12°31′S 123°33′E / 12.517°S 123.550°E / -12.517; 123.550, on the edge of the Sahul Shelf, about 300 kilometres (190 mi) off the north west coast of Western Australia, 200 kilometres (120 mi) south of the Indonesian island of Roti, and 70 kilometres (43 mi) south-east of Ashmore Reef.

At the southern edge of the reef is a shipwreck of the Ann Millicent, an iron-hulled barge of 944 tons wrecked in 1888. The remains of an RAAF Beaufighter can also be seen at low tide. Formerly used as a bombing range, access to the island is prohibited because of the risk of unexploded ordnance. The area is still a gazetted Defence Practice Area, but is no longer in active use.

Cartier Island is completely unvegetated except for the seagrass Thalassia hemprichii, which grows in pockets of sand within the reef, and may be exposed at low tide.^[2]