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.