This passage way comes off the main trade route that runs along the Lake of Spires, in my world I have it as an old dragon lair that has become submerged over time. I am not sure if I am going to put the dragon in undead state existing in the water or perhaps some underwater monsters that feed off those that use the shore line as a resting location.
Check out Maps of an Uncharted World to download full versions of the maps.
Check out Maps of an Uncharted World to download full versions of the maps.