Over billions of years, the continents have moved around the globe. At this moment, the two continents that have the closest shape similarities are South America and Africa.
Billions of years ago, Earth was home to one giant land mass known as Pangaea. As time has passed, the movement of the tectonic plates under Earth's crust has separated this land mass into seven continents. When examining the edges of continents on a globe, one can not only see how similar the continents are but also see the way they would fit together if the earth shifted back to its original state.