Help needed with mountain scales in big terrain

Hi all!

I’m trying to create a snow covered valley surrounded with high mountains -or a flat area surrounded with mountains etc- but I have a problem. When I create a simple mountain, it seems on scale and high enough however the terrain should cover multiple mountains including the flat area so when I increase my terrain size to lets say 18km x 18 km, those mountains become more like hills. They don’t look high enough comparing to flat places. Should I do a tiled terrain? Is there any way to get it done with just one tile?

I’m attaching the pictures including a reference geo.

Any help is appreciated.

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