The Scoglio d'Africa [2] (or Scoglio d'Affrica) also named Formica di Monte Cristo ("Monte Cristo's Ant"), is a solitary small skerry belonging to the Tuscan Archipelago located in open sea between the Tyrrhenian Sea and the Corsica Channel.

Regarding its size and its shape, it can be considered to all effects an emergent rock in a stretch of shallow sea.

It has a rounded contour with the diameter of 70 m (230 feet), an area of 3,000 m2 (32,000 sq ft) and an altitude of only 3 m (10 feet) above sea level depending from the tides and the waves.

Geologically the skerry belongs to a submarine ridge starting few miles east of Capraia and it extends toward south up to reach Pianosa.

The depths in the region among the skerry and Montecristo reach 200 m (660 feet).