The João Valente Bank is a coral reef located between the islands of Boa Vista and Maio, Cape Verde. It stands on a seamount (guyot) about 100 meters (330 ft) under sea level, and rises up to 10 meters (33 ft) below the surface. The seamount rises from about 1,000 meters (3,300 ft). It is about 15 nmi long and 9 nmi wide, and breaking waves can already be observed at moderate wind. The reef has a high biodiversity of fish.