The Challenge Isles are the furthest west islands of the Vilhun archipelago, able to be seen on exceptionally clear skies even from Ferweth. It is said to be the home of Kitsune and thus consisting the majority of its population, although an increasingly smaller one.
The individual islands, starting from the largest, are Lisa, Lisey, Lisma, and Listi. The ownership of the three islands beyond Lisa have been long-contested with the goblin tribes at the Greenkleks isle, but due to the commonality of Kitsune on those islands, its generally regarded as property of the Challenge Isles.