evidence: Three of the islands – the Glorioso Islands, Juan de Nova and Europa – and the Bassas da India atoll, lie in the Mozambique Channel west of Madagascar, while the fourth island, Tromelin, lies about 450 kilometres (280 mi) east of Madagascar. Also in the Mozambique Channel is the Banc du Geyser, a reef under French control claimed by Madagascar since 1976. France and Comoros view the Banc du Geyser as part of the Glorioso Islands.