User blog comment:DYBAD/Character Sheet/@comment-25417020-20141029134014/@comment-4867780-20141030210454

A plane with nothing but a big high-tech city surrounded by magical lands, gradually expanded via resource input to keep up with the population increase. Possibly multi-layered though, for a more efficient management of space. That's why I called it a demi-plane : a plane of limited size fulfilling a precise purpose, rather than a gigantic wilderness.