The Shifting Islands
There are countless islands on the edge of the Sea of Chaos, varying dramatically in size, each with its own environment. These are constantly changing, but they change slowly; it can take anywhere from a day to a week for an island to shift from a barren desert to a verdant jungle. Weather is generally more dynamic, and often at odds with the environment; a vast desert can suddenly face a dramatic blizzard.
The primary denizens of the Shifting Islands are monstrosities and beasts that blend the features of multiple creatures. Populations expand and contract, and don’t have to be sustainable, so adventurers could find a plateau filled with griffons, or a realm of chimeras where each one has a different arrangement of heads. The intelligent i nhabitants of the island are almost entirely slaadi, but they aren’t necessarily hostile.