Ascension Island is an isolated volcanic island in the equatorial waters of the South Atlantic Ocean , around 1,600 kilometres ( 1,000 mi ) from the coast of Africa and 2,250 kilometres ( 1,400 mi ) from the coast of South America , which is roughly midway between the horn of South America and Africa .
Ascension Island is an isolated and relatively young volcanic island in the South Atlantic Ocean , some 100 km ( 62 mi ) west of the mid-Atlantic Ridge , 1,504 km ( 935 mi ) from Liberia ( Cape Palmas ) , and 2,232 km ( 1,387 mi ) from Brazil ( Recife ) .