This puzzle is not underground.
Map
Desert Obelisk
NW #3
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The puzzle is on on a man-made structure in the desert.
The puzzle is not on the main temple.
Sail the boat counter-clockwise past the desert and look up at the shiny thing on top of the cliff.
You will draw the circle first, then as the boat moves, you can draw the rest of the path.
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Complete spoiler:
Roll over each black area below for hints.
Each new hint gives away more than the previous one.
Although the puzzle is on a man-made structure in the desert, you won't be standing in the desert when you see it.
You'll be riding on the boat when you see it.
You will draw the path from left to right.
Show hints
Intro
This is a fun one.
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE