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.

Find part of a circle on the center tree. Line it up with the rest of the circle on another tree. Trace to the left and slightly upward.

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Look for green bark.

Look for circles in the bark.

Try to get a line that goes along the trees.