which two continents have the most obvious fit of the coastlines

The two continents with the most obvious fit of their coastlines are Africa and South America. Their coastlines, particularly the eastern coast of South America and the western coast of Africa, fit together like pieces of a jigsaw puzzle. This striking fit of coastlines is a key piece of evidence for the theory of continental drift and the former existence of the supercontinent Pangaea, from which these continents later drifted apart.