One idea: on the islands map, instead of deleted castles and settlements because they are submerged, keep that as lairs and such for Nixies, Pixies, Aquamancers, etc. Perhaps even keeping some of the detail of the now submerged terrain with deeper and shallow places, and sea valleys, etc.
Viewing post in Outdoor Survival Remix comments
Hey thanks! The castles & towns have actually been moved around rather than deleted – there are 24 & 9, respectively. The map isn’t strictly a flooded version of the original OS map, but a new map with the same ratio of terrain features (plus ocean). But I like the idea of fleshing out the underwater terrain – will definitely tinker with it if/when I revisit these.