Carthage (an ancient city in North Africa, in modern Tunisia); Carthage (an ancient civilisation in North Africa, centred on the city of Carthage); Cartago (a province of Costa Rica); Cartago (a city in Costa Rica)
Casablanca (the capital city of the region of Casablanca-Settat, Morocco); Casablanca (a city in the province of Valparaíso, Chile); a department of Chile
Castile (a medieval kingdom and former county in the Iberian Peninsula; the nucleus of modern Spain); Castile (a vaguely defined geographical region of central Spain generally corresponding to the regions of Old and New Castile); a province of Arequipa, Peru; a surname