* The Panama Canal, a 77-kilometre bypass across the Isthmus of Panama, connects the Caribbean Sea (a mediterranean sea of the Atlantic Ocean) to the Pacific. Though physiographically a transcontinental nation, all of Panama—including the segment east of the Panama Canal—is often considered a part of North America alone.
There was a nation of Central America in the early 19th century, consisting of the present day nations of Guatemala, Honduras, El Salvador, Nicaragua, and Costa Rica (and a portion of the modern Mexican state of Chiapas). This was sometimes known as the United Provinces of Central America or the United States of Central America.
Most of Central America rests atop the Caribbean Plate. The region is geologically active, with volcanic eruptions and earthquakes occurring from time to time. In 1931 and 1972 earthquakes devastated Managua, the capital of Nicaragua. Fertile soils from weathered volcanic lavas have made it possible to sustain dense populations in the agriculturally productive highland areas.
