Islands are a kind of Location in Sea of Thieves, the other kinds being Outposts, Fortresses, and Uncharted Locations. An Island is defined by any landmass that can be subject to a Quest. There are small Islands and large Islands. Large islands contain many Animals of two kinds that are guaranteed to spawn. Small islands contain few Animals of only one kind that are not guaranteed to spawn. In addition, only large Islands are subject to Riddle Maps.