Trying to flatten the top of a mountain

Hi there, I’ve been working with Gaea for a couple of days. I’ve made a basic mountain, I would like to make the top completely flat so I can put my outpost on it. Could anyone help with the nodes I could use to achieve this please. Many thanks.

/clip node/modifier will remove the top or bottom of a given range cleanly. Probably what you are looking for.

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Soft Clip node is cool as well, more adjustments in it.