How to create island with Discplacement and dont separate whole mesh?

enter image description here enter image description here I have island. I see it whole in camera - i shouldnt make separate a parts. But I have displacement in this mesh, it looks enough on the mount, but bad looks on the ground. How i can use soft gradient for displacement? How can I make a soft gradient so that the displacement map only works on the mountain, but does not work on the ground?

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resolved. Just create mask (b/w texture. White is mountain, black is no displacement) and use this nodes.

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