Construction of locks on Panama Canal, 1913

The Culbera Cut of the Panama Canal, 1907

The Panama Canal is a 77-kilometre (48 mi) ship canal in Panama that joins the Atlantic Ocean and the Pacific Ocean and is a key conduit for international maritime trade. Built from 1904 to 1914, over 815,000 vessels have passed through the canal. It has been named one of the seven modern wonders of the world by the American Society of Civil Engineers.

One of the largest and most difficult engineering projects ever undertaken, the canal had an enormous impact on shipping between the two oceans, replacing the long and treacherous route via either the Strait of Magellan or Cape Horn at the southernmost tip of South America. A ship sailing from New York to San Francisco via the canal travels 9,500 km (5,900 mi), well under half the 22,500 km (14,000 mi) route around Cape Horn.

The concept of a canal near Panama dates to the early 16th century. The first attempt to construct a canal began in 1880 under French leadership, but was abandoned after 21,900 workers died, largely from disease (particularly malaria and yellow fever) and landslides. The United States launched a second effort, incurring a further 5,600 deaths but succeeding in opening the canal in 1914. The U.S. controlled the canal and the Canal Zone surrounding it until the 1977 Torrijos–Carter Treaties provided for the transition of control to Panama. From 1979 to 1999 the canal was under joint U.S.–Panamanian administration, and from 31 December 1999 command of the waterway was assumed by the Panama Canal Authority, an agency of the Panamanian government. [Source: Wikipedia]