depth of water of some 20 metres. Uninhabited Île Nelson lies 35 km south of Salomon Atoll. A hundred km to the southwest of Nelson are the 3 islands of Trois Frères, which were briefly inhabited in the 19th century. Further west lies the Île d'Aigle, which was inhabited until 1935. Île Vache Marine, the southernmost of the Eagle Islands, lies south. Danger Island Île Danger, 20 km south of Île d'Aigle, has never been inhabited; it is a long and flat island with a maximum width of . It is covered with tall coconut trees and shrubs. Six Îles, or Egmont Atoll Finally, Six Îles Atoll (also called Egmont), further south of Danger, was also occupied for short periods during the mid 19th century until 1935. Besides the six named islands, the atoll also includes a seventh unnamed island. The atoll, in the form of "U", is a small strip of land with width varying from to a maximum of at its northern extremity. The total land area of the atoll is . A fringing reef circumscribes the atoll. There are two openings into the ocean. It almost encompasses a large lagoon. The lagoon itself is in length and is more than in width. Rounded pumice stones found on the eastern beach of the island by one of the explorers of the island have been inferred as debris from the Krakatoa volcanic eruption of 1883 The atoll is to the northwest of Diego Garcia, on the Great Chagos Bank. The islands are connected by reefs which are steep and there are no locations for anchorage on its shores. Human geography In the late 18th century, coconut palm plantations were established on the island to produce copra for which slave labourers were brought in from Africa. A small population lived in the archipelago, descendants of Mauritian laborers working the copra industry. After an agreement was signed in 1966 between Britain and the United States, the US built a military base and forcibly evacuated all indigenous people; 1,200 from Diego Garcia, Ile du Coin, and Île Boddam were relocated to Mauritius, while others went to the Seychelles. In 2000, the Chagos islanders won an appeal which restored their authority to live on the islands, and they received UK citizenship in the following year. A 2008 court decision blocked their return. Further complications arose after the 2010 establishment of the world's largest