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I want to add vegetation to my rocky semi-desert scene of Himalayan mountains, using geometry nodes. In that scenery, vegetation only grows in valleys, where water would sometimes flow.
Note that by valleys I also mean slopes between hills and flat surfaces in various heights, surrounded by mountains.

The OPPOSITE of the tree distribution in this picture: enter image description here

How do I do that procedurally, meaning without weight painting the valleys by hand?
I tried to find some vector math trick, but failed to do so. Please help!

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