A canal bisecting the Isthmus of Panama and linking the Atlantic and Pacific Oceans. It is 82 km/51 mi long, and 150 m/490 ft wide in most places; built by the US Corps of Engineers (1904–14). In 1979, US control of the Panama Canal Zone (8 km/5 mi of land flanking the canal, formerly the site of a US military installation) was passed to the Republic of Panama, which guaranteed the neutrality of the waterway itself when it took over operational control of the canal in 1999. A major upgrading and widening project, announced in 2007, is due for completion in 2014.