Off lying danger.Plateau des Birvideaux (47°29'N., 3°17'W.), an extensive rocky bank with a least depth of 2m, lies centered 6.5 miles W of Beg el Lan. A light is shown from a prominent tower, 36m high, standing on the shallowest part of this bank. In bad weather, the sea breaks heavily over it and vessels are advised to give this danger a wide berth.

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