ARGUIN, an island (identified by some writers with Hanno's Cerne) , off the west coast of Africa, immediately south-east of Cape Blanco, in 20° 25' N., 16° 37' W. It is some 4m. long by 21 broad, produces gum-arabic, and is the seat of a lucrative tur tle-fishery. Off the island, which was discovered by the Portuguese in the 15th century, are extensive and dangerous reefs. Arguin was occupied in turn by Portuguese, Dutch, English and finally French. Aridity and bad anchorage prevent permanent settle ment ; the fishing is mostly done from the Canary Isles.