Panama Canal Zone
The Panama Canal Zone () was an unincorporated territory of the United States from 1903 to 1979, centered on the Panama Canal and surrounded by the Republic of Panama. The zone consisted of the canal and an area generally extending on each side of the centerline, excluding Panama City and Colón, which otherwise would have been partly within the limits of the Zone. Its border spanned three of Panama's provinces. When reservoirs were created to assure a steady supply of water for the locks, those lakes were included within the Zone.
Title 35 of the Code of Federal Regulations
Title 35 of the Code of Federal Regulations (35 CFR) was a United States federal government regulation on the Panama Canal. The U.S. controlled the Panama Canal Zone from 1904 to 1999. The Torrijos–Carter Treaties provided for handover to Panama. After a period of joint American–Panamanian control, the canal was taken over by the Panamanian government in 1999, and is now operated by the Panama Canal Authority, a Panamanian government agency.