Kash
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In short, here's what you do:
Go southeast, there's a tree there. Climb it, climb down, go northwest the same distance. Turn left, go straight for 2 days, turn northwest and go for another 2 days. Look around – there should be a sign with the inscription "detour" somewhere there. Well, that's how it worked for me, I don't know where the detour is for you.