Panama Canal Zone
The Panama Canal Zone () was a territory inside of Panama, consisting of the Panama Canal and an area generally extending on each side of the centerline, but excluding Panama City and Colón, which would have otherwise fallen in part within the limits of the Canal Zone. Its border spanned two of Panama's provinces and was created on November 18, 1903, with the signing of the Hay–Bunau-Varilla Treaty. When artificial lakes were created to assure a steady supply of water for the locks, those lakes were included within the zone.