evidence: Banc du Geyser (also Banc du Geysir) is a mostly submerged reef in the Mozambique Channel's northeastern part, 125 km (78 mi) northeast from Mayotte, 112 km (70 mi) southwest of the Glorioso Islands and 200 km (124 mi) off the northwestern coast of Madagascar. The Banc is a dangerous oval-shaped reef 8 km (5 mi) long and 5 km (3 mi) wide that becomes exposed only at low tides, with the exception of some rock formations in the southern part of the reef. The rocks are generally 1.5 to 3 m (5 to 10 ft) in height; the largest is South Rock, with a height of 8 m (26 ft), similar to a boat under sail. [...] France and the Comoros claim the Banc du Geyser as part of their exclusive economic zone (EEZ). The reef is also claimed by Madagascar. From the French point of view, it is a part of the EEZ of Glorioso Islands, one of their Scattered Islands in the Indian Ocean. Madagascar announced its annexation in 1976, presumably because of the possibility of oil fields in the vicinity but the Banc du Geyser is controlled in fact by the French forces armées de la zone sud de l'océan Indien.