Head up the mountain path from the obelisk. After passing the greenhouse, the grassy trail will split. Take the left path and quickly turn right, then take a look at the bushes here. You should see the shape you're hunting for in the dark parts of the cluster of shrubs found here.
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Complete spoiler:
Roll over each black area below for hints.
Each new hint gives away more than the previous one.
Intro
Not difficult but not too obvious. Not the most delightful puzzle in the game but not the most boring, either.
To find this one, you won't have to venture "off the beaten path"
The path you'll find it near is actually pretty grassy (not "beaten")
It isn't very far from the obelisk
Look for it as you hike up and around the mountain
You will find it in a shrubbery patch
Map
River Obelisk
East #6
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This one is not indoors or underground
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE