Atlantica

thumb|Atlantica at about 2 Ga. Archean cratons in grey. Atlantica (; Atlantika) is an ancient continent that formed during the Proterozoic about (two billion years ago, Ga) from various 2 Ga cratons located in what are now West Africa and eastern South America. The name, introduced by John Rogers in 1996, was chosen because the parts of the ancient continent are now located on opposite sides of the South Atlantic Ocean.

== Formation == Atlantica formed simultaneously with Nena at about 1.9 Ga from Archaean cratons, including Amazonia in present-day South America, and the Congo, West Africa and North Africa Cratons in Africa.