The Isthmus of Panama, also known as the Golden Castile or Tierra Firme, is a strip of land formed about three million years ago, connecting North America with South America, It is the narrowest part of the continent stretching from the borders of Costa Rica through Panama to the borders of Colombia. The Isthmus of Panama, about 640 kilometers long and ranging from 47 to 192 kilometers wide, separates the Atlantic Ocean (Caribbean Sea) from the Pacific Ocean (Gulf of Panama).
The Isthmus of Panama has been crossed by the Panama Canal since 1914.
