Possible Clues:

• Spanish port on the Mediterranean
• Oil-refining centre in Colombia, on the Caribbean Sea
• Spanish city founded in 221BC, a naval station in Murcia
• Port in Spain or Colombia
• Colombian port
• Conveyance cost not applicable in Spanish port
• South American city
• Spanish port, originally named Mastia
• Conveyance charge not applicable in Spanish port
• Spanish town (28 one largely inapplicable)