ship canal across the Isthmus of Panama, connecting the Caribbean Sea (hence, Atlantic Ocean) and the Pacific Ocean: c. 50.7 mi (82 km) long
See Panama Canal in American Heritage Dictionary 4
A ship canal, about 82 km (51 mi) long, crossing the Isthmus of Panama in the Canal Zone and connecting the Caribbean Sea with the Pacific Ocean. It was begun by the French in 1881, but the project was abandoned in 1889. The United States gained construction rights after Panama declared its independence in 1903, and the canal was opened to traffic on August 15, 1914. A 1977 treaty stipulated that the Panamanians gained full rights of sovereignty over the canal on December 31, 1999.