This one is completed from within the monastery.
Map
Monastery Obelisk
NW 5
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You will need to open a set of shutters for it.
It's through the centre "window" revealed by the shutters you've opened.
Go inside the monastery. Open up the leftmost shutters using the puzzle with the small red tree.
Stand in the right place so that the yellow gourd, together with the yellow markings on the broken bridge in the centre "window", are visible as a circle. Start tracing there.
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Complete spoilers:
Roll over each black area below for hints.
Each new hint gives away more than the previous one.
Open up the set of shutters left of the entrance.
What can you see that might work as the start of the puzzle? What might be a possible line?
Make sure you're standing in the correct spot for this one.
Show hints
Intro
This one is a little finicky to solve, but easy to find.
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE