A tricky puzzle. Make sure you're not barking up the wrong tree.

It is on a tree.

Or, rather, it's on more than one tree.

Walk from the obelisk into the jungle, and you'll come across trees covered in light green moss patterns.

This particular puzzle is a little tricky. It requires backing up a little distance away from the large green circles. You'll step onto some rocks, and find yourself behind a skinny tree with a much smaller green circle.

Line this small green circle up with a larger circle on the tree about 20 feet in front of you. Then trace. Up, then left, then down.

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Look for green bark.

Look for circles in the bark.

You'll be matching a large green circle with a much smaller one.