Has anyone ever explored the underwater streambeds/lake bottoms on the Valeia Map or the Ishad N'ha maps? I have looked around a little bit, but not seriously explored. I was just curious if anyone else had found anything interesting at the bottom of the lakes.

Have explored a lot.. not much personally .. but someone mentioned an underwater chest that I never seen.. do a search?

What I always do is use Spirit Eye. See a white dot? If so, go find it... Otherwise, don't bother. This is also how I find quests people and monsters. Being as they are the only red dots that aren't near me.