Mecha Island contains machines that are more advanced than certain areas of the norm in the world, though most of the people live in normal towns. The island is actually a giant sleeping sea turtle that only wakes up every one thousand years to lay her eggs. Because of this, no Log Pose will point towards it as it does not have any magnetic field, making it impossible to find. The only known way to reach this island is by using a "Turtle Pose", which uses a tiny baby sea turtle as a compass. The island used to be called the Island Turtle (シマガメ,Shimagame?) for this reason.
Ratchet rules over this island as the feudal lord, and is the genius scientist who created the advanced machinery around. He intended to use it as his base of operation for world domination, but was ultimately defeated by the Straw Hat Pirates.