Saint Peter and Saint Paul Archipelago

The Saint Peter and Saint Paul Archipelago is a group of 15 small islets and rocks in the central equatorial Atlantic Ocean. It lies in the Intertropical Convergence Zone, a region of the Atlantic characterized by low average winds punctuated with local thunderstorms. It lies approximately 510 nmi from the nearest point of mainland South America; 625 km northeast of the archipelago of Fernando de Noronha; 990 km from the city of Natal; and 1,824 km from the west coast of Africa. Administratively, the archipelago belongs to Brazil and is part of the special "state district" of Fernando de Noronha, in the state of Pernambuco, in spite of the very large distance between the two island groups and the even larger distance to the state mainland.

The islets expose serpentinized abyssal mantle peridotite and kaersutite-bearing ultramafic mylonite atop the world's highest and yet only second largest megamullion.