This is the folder that any images you take using the FullMapScreenshot mod will go.

The hotkey to activate this mod is "O". After hitting "O", this mod will render multiple pictures of the map you are currently on, stitch them together, save them to this folder as a ".jpg", and then relocate the camera back onto the character you are controlling.

By default, this mod will be disabled. If you want to use it, you will first need to toggle it on in the game's options (this will be memorized for future game launches).
There is also an additional feature which displays connected locations. If you want to take a clean screenshot of the map, you can toggle this feature off.