Rotations like that need to be done with a larger scale terrain, then transformed down to the desired size. The data “outside” the bounds simply isn’t there otherwise.
For what it looks like you are trying to achieve though, your mask and combine setup isn’t right (I’m guessing that combine is multiply).
You want to drill that specific shaped hole into the center? You are better off inverting your mask and subtracting it. You want to isolate a mask’s white data to only where you need it, otherwise it just gets in the way like what you’re seeing.
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Oh thank you so much for your insight and you’re right this is exactly what I needed.
The thing is after subtracting the lake it’s too flat now and I can’t blend the edges correctly with the landscape. It looks sharp cut.
What do you recommend that I do ?
Where is this lake mask coming from?
As you can see, just subtracting a sharp edge mask will give you sharp cliffs to deal with. There are nodes that can soften those cliffs like Distance and Blur, but you’ll still be left with a uniform rim unless work to break it up.
A better approach would be to use/make a lake mask with a height/depth falloff in the center and edges. A very small mountain subtracted from the center would give you a nice pit with slopes.
There are a few other ways to go about it, if you really wanted to keep the lake edges exactly how you have them, don’t just subtract the lake, use it as a mask to Blend between another lakebed looking terrain. You’ll still likely want to blur the mask a bit.
Last tip, blurring the lake mask slightly, then Shaping it “outward”, you’ll get a mask just slightly larger than your lake, like a shore. Take this shore and use it as a mask for a very small-scale Erosion pass on your main terrain. This will create little flow channels into your lake where water would naturally pour in.
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You’re extremely helpful. Can’t thank you enough for your insight. Gonna try to apply your tips as soon as possible. Thanks again.