The Saint Peter and Saint Paul Archipelago is a group of 15 small islets and rocks in the central equatorial Atlantic Ocean. It lies approximately 510 nmi (940 km; 590 mi) from the nearest point of mainland South America (the northeastern Brazilian coastal town of Touros); 625 km (388 mi) northeast of the archipelago of Fernando de Noronha; and 1,824 km (1,133 mi) from the west coast of Africa. Administratively, the archipelago belongs to Brazil.

This grouping is the sole location in the Atlantic Ocean where the abyssal mantle is exposed above sea level. In 1986, the archipelago was designated an environmentally protected area.

More Info: en.wikipedia.org