The Isle of Tonahamen, more commonly known as Thursday's Island, is a very small deserted island located in the Circle Sea. Its sole inhabitant is a very lonely man named Thursday.
The Isle cannot be reached magically (i.e. via JPOCT, Divine Hand, or flying). Any hopeful visitors must use the Travelling shop, or swim.
Bluius' Circle Sea Map The Isle is in the far upper left corner.
Isle of TonahamenA map of the Isle proper.