Oh and to the person who mentioned fresh water, yes the game says that. There are fresh water seas.
Yes undersea, so probably a side-effect of the powerful tadpole virtually drilling hundreds meters down (usual procedure) to finally detect a fresh water pocket (and expect a deep gnome settlement nearby). All of that while your character, feet in the sand, is watching the river flow.
Hey I like you but you are too powerful, my tadpole cannot compete so, please, do not spoil, I don't want to know who the final boss is.