- Banc du Geyser
Banc du Geysir (also Banc du Geyser) is a mostly submerged
reef in theMozambique Channel 's northeastern part, 125 km northeast fromMayotte , 112 km southwest of the Îles Glorieuses, and 200 km off the northwestern coast ofMadagascar , at coord|12|21|S|46|26|E|type:isle_|display=inline,title.The Banc is a dangerous oval-shaped reef 8 km long and 5 km 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 meters in height; the largest is South Rock, with a height of 8 meters, similar to a boat under sail. In the eastern part of the reef there are some sandy cays, 1 to 3 meters in height covered with grass and small bushes. The entrance into the central lagoon is possible from a south-southeastern direction. There is an abundance of
sea bird s, and thecay s are covered in tons ofguano .The Geysir Reef was first known by
Arab sailors around the year 700, and was shown on some navigation-charts dated around 800. Around 1650 the reef was shown on Spanish maps as "Arecife de Santo Antonio". The current name was given on23 December 1678 , when the British vessel "Geysir" ran on the reef.The reef is claimed by France,
Madagascar and theComoros alike. From the French point of view, it is part of theirScattered islands in the Indian Ocean ; Madagascar announced its annexation in 1976, presumably because of the possibility ofoil field s in the vicinity. TheComoros claim the Banc du Geysir as part of itsexclusive economic zone .About 20 km southwest of Geysir is
Zélée Bank , a deep submarine feature.External links
* [http://www.oceandots.com/indian/mozambique-channel/banc-geyser.htm Satellite images of Banc du Geysir]
* [http://permanent.access.gpo.gov/websites/pollux/pollux.nss.nima.mil/NAV_PUBS/SD/pub171/171sec09.pdf Sailing Directions: East Africa and the South Indian Ocean]
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