Banc du Geyser

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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.

Adapted from Wikipedia (CC BY-SA). Photography via Wikimedia Commons.