Why "Panama Canal" Has No Apostrophe-S

"The Panama Canal" is a proper noun naming a specific engineered waterway. Proper nouns—especially unique, named infrastructure—do not take possessive form.

Grammar Note

• Panama is the country; Panamanian is the adjective.
• The canal is of Panama, not Panama's (though "Panama's canal" is grammatically possible, the official name is fixed).
• Compare: Suez Canal, Kiel Canal, Corinth Canal—none use apostrophe-s.

It's a naming convention: unique, capitalized, non-possessive.