Turtlewise

Turtlewise is a giant flying turtle with a city on its back, inhabited by the Wisemen. It is the only island that moves around, and as such, it can be difficult to tell when or where it may be at any given moment. It changes its position at the end of every day.

The Wisemen do many things, including sending you on some of ther game's longer missions. They also sell many craftable items, making turtlewise the early ingame source for things required to build production facilities, such as lumber and bricks.

The Wisemen will give you many clues on what is needed to advance into the endgame, so be sure to visit them often.