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quick hint on exit shortcuts which are not hidden but still easy to miss:
Temple Ruins: After you complete the temple ruins / Umar quest and the forest transforms you can exit the map directly on the eastern edge. No need to walk back through the ruins.
Druid grove: After finishing the druid quest you can exit the map directly on the western edge. No need to retrace your steps through the swamp.
Might seem obvious but it took my linear mind years to even look for them, just automatically walking back the way I came and cursing especially about the lava pool in the ruins time and time again. I'm pretty sure I'm not the only one...
Are there any other ones?