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The Dion Islands, situated 13.5 kilometres south of the south-western extremity of Adelaide Island in north-western Marguerite Bay (Map 1), is a small archipelago comprising the following islands, rocks and reefs: Envoy Rock, Regent Reef, Consort Islands (approximately 3 hectares), Emperor Island (approximately 5 hectares), Jester Rock, Noble Rocks, Courtier Islands (approximately 8 hectares), Embassy Islands and Consul Reef. The islands are generally small, rocky and precipitous, especially Emperor Island, which at a maximum elevation of 46 metres is also the highest.