This only requires having the right perspective.
Map
Quarry Obelisk
North #5
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It's in the quarry.
It's on the ground.
It's viewed from above.
Stand on the roof of the factory in the quarry and look down towards the dam. It's visible on the ground of the quarry floor.
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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
It's easy to walk by this shape and not notice it.
It's fairly large.
This one is okay. Purely visual.
Where are there high vantage points in the quarry?
THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE