Finding this path just requires you to look in the right direction.
Map
Desert Obelisk
East #1
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Start at the obelisk, walk off in that direction, and keep an eye out for the shape.
The hints pretty much tell you everything. Walk east from the obelisk over to the sand. Look down at the sand and you'll quickly find a snake shape formed by the ripples of the sand.
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Complete spoiler:
Roll over each black area below for hints.
Each new hint gives away more than the previous one.
You'll be standing on sand when you see it.
The shape itself is on the sand.
Show hints
Intro
There's not much to this puzzle. But at least it's easy.
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE