#landscape creation
Well, if I understand your question correctly, what you could try to do
is use the IPAS FRACTALIZE routine to create your initial mountain and then go
ahead and SELECT/FACES near the bottom areas of the mountain (or your
sea-level).. go ahead and perform a MODIFY/FACE/TAPER (or experiment with some
of the other modify/face deformations) to get the bottom edges of your mountain
to match up level with the water..
— Steve, hope it helps