Marine Ships[1] are ships that serve the Marines, acting as their transportation and means of fighting naval warfare.

They have two to four masts with two to three sails per mast. The decorations and paint job is always kept within the same style and there is little variation between ships beyond size and armaments. The standard paint covering the outer hull is normally a greenish-blue basis, patterned with darker streaks of the same, a style also found on the exterior of most Marine bases. Superstructures are usually painted black. Only a few notable Marines have ships that do not follow the standard design and paint job.

Marine ships are among the few vessels in the world that can safely traverse the Calm Belt. The two features that make this possible are Seastone, which lines the bottom of the ships and makes them undetectable by Sea Kings, and paddle-wheels, which propels the ship forward despite a complete lack of wind. Only battleships have been seen with these features.