Keelhaul Key

In Paper Mario: The Thousand-Year Door, Keelhaul Key is an island off the coast of Rogueport. It is the location of the fifth Crystal Star, the Sapphire Star.

According to legend in Rogueport, the pirate captain Cortez inhabits the island, and places a fatal curse on all those who come there to protect his treasure.

Mario gets passage to the island by convincing a Rogueport merchant, Flavio, to sail there for Cortez's treasure. However, Flavio's ship (the Flavio) requires a helmsmen, and so Mario goes out to recruit Admiral Bobbery. After doing so, the ship sets off.

Off the coast of Keelhaul Key, the ship is sunk by ghosts, and a shanty town is constructed from parts of the ship. After this, Mario sets out to find Cortez's lair and the Sapphire Star.

Once that task is completed, Mario can return to Keelhaul Key and the shanty town anytime by using Cortez's ship, or a hidden WarP pipe in Rogueport.