The color purple will help narrow your search
Look for this one in the Color Swamp
It is on the swamp floor, formed from purple shapes.
Starting from the obelisk, head down the path that leads to the summit. Take the correct path and you will reach a rock outcrop overlooking the purple portion of the Color Swamp.
There are a couple yellow platforms here that can be moved by solving a panel puzzle nearby/below. If you haven't moved these yet, the platforms will be in the correct position for this puzzle to be visible. If you have already messed with these platforms, simply go back to the control panel puzzle and reposition them until you've uncovered this puzzle.
This may require you to take the long way around to get back to the rock outcrop, where you can then solve the puzzle.
One more thing: There are two more environmental puzzles in this same location, each requiring the platforms to be in different positions. Before moving on, you might want to keep playing with these platforms until you uncover all three.
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Complete spoiler:
If you have moved a platform, you may have covered this puzzle
Roll over each black area below for hints.
Each new hint gives away more than the previous one.
Intro
If you missed this one, you may have unknowingly covered it up. Don't worry, you can uncover it again.
Not very close to the obelisk, but not very far either
Location:
Should only take a short hike to get there
The exact location of this puzzle might be described as a bit murky
To see this one, you'll need to look down on it
Solving this one won't require DEEP thinking
Hints:
Map
River Obelisk
East #2
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THE WITNESS - ENVIRONMENTAL PUZZLE HINT GUIDE