Surface from curves

Hi, im trying to make a surface on some level curves but loft is not working, what can i do? I want the red one to be one mountain and the blue one another
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Welcome to Rhino.
You need to do a bunch of cleanups before you start lofting (or any other surfacing task) since there is no automated way to do it.
I suggest going through these 2 videos, both are really great in modeling terrains.

and more:

and Keep learning.


it is always tricky to work with this type of geometry.

i know its not exactly what you would like to see.
patch can help you too, sometimes.

delaunay, maybe after remesh?

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