I really liked the idea of the (sometimes cannibal) ice tribes ruled by demons disguised as witches. In the description I implied that the demons created enchanted winters far longer and hardher than normal so as to strengthen their minions and cull off the unworthy. Although it would normally be weird to have a tundra so close to a jungle, seeing as these are demons with great power over ice and snow, a tundra could exist due to their magic.

For the name of the world I like Crete. Or maybe Cyprus. Lots of little islands have cool names.