I was on the way to the vahnatai lands and the power went out for a second, but luckily, I saved a few seconds before, after launching again, this happened:
Save at homescreen:
(You can see the map is deep rapids)
After moving around for a really long time:
(I cannot pilot the boat or get out of it)
I believe the map name of "Long tunnel" appeared at some point and the console even said "You have discovered a new location!" When moving around, the characters' movement is not limited meaning its not a graphic error, while outdoor mobs only traversed in certain locations. I've tried fighting them, and after ending combat, the map is still glitched.
The exclamation marks on the map still display the correct names. I imagine the save just got corrupted, but I saved the game before the power outage.