Banc Vailheu

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Banc Vailheu is a submerged volcano in the Comoro Islands group. It is located approximately 13 nmi (24 km, 15 mi) west of Grand Comoro and extends for nine miles underwater. Banc Vailheu is a wall Scuba diving location.

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