Dungeon Craft: Hell & High Water - Rules of Play says:

Have you ever wanted to Sail the High Seas? or Escape the bowels of hell? Well, this Dungeon Craft companion book contains an additional Hundreds of reversible game pieces to further enhance your tabletop RPG experience!

Contains: Ships, Demons, Ancient Evils, Ports, Hellish Wastelands, Ancient Architecture, Infernal Machines, Sunken Relics, & MORE!