Isthmus of Panama

The Isthmus of Panama () is the narrow strip of land that lies between the Caribbean Sea and the Pacific Ocean. It links North and South America. It contains the country of Panama and the Panama Canal.
The isthmus formed about four million years ago.&lt;ref name="/"&gt;&lt;/ref&gt; It separated the Atlantic and Pacific Oceans. It caused the Gulf Stream. 
Its history was first suggested in 1910 by North American paleontologist Henry Fairfield Osborn. He based the proposal on the fossil record of mammals in Central America. 
Osborn's ideas were used by Alfred Wegener when he proposed the theory of continental drift in 1912.