Middle America (Americas)

Colombia and Venezuela of Caribbean South America are sometimes included in this subregion. The Caribbean is occasionally excluded from this subregion while The Guianas are infrequently included.

Geography

Physiographically, Middle America marks the territorial transition between Northern America and South America, connecting yet separating the two. On the west, the Middle American mainland comprises the tapering, isthmian tract of the American landmass between the southern Rocky Mountains in the southern United States and the northern tip of the Andes in Colombia, separating the Pacific Ocean on the west and the Atlantic Ocean (viz. the Gulf of Mexico and Caribbean Sea) on the east, while the Greater and Lesser Antilles form an island arc in the east. The region developed subaerially southward from North America as a complex volcanic arc-trench system during the Early Cretaceous period, eventually forming the land bridge during the Pliocene epoch when its southern end (at Panama) collided with South America through tectonic action.