Name of program? "Scenery and mountain creator"?

[carls]

I think it was something like you could type some numbers and the computer would generate a mountain scenery with sky, greens and lakes.
It ran fine on A500. Took a little while to generate the picture.
 
I think it was freeware.

Sounds like FracLand to me. It's a really old PD program. It's been used to create the basis of this picture: http://artcity.bitfellas.org/gallery/j/j.o.e./21598_fractalexp.png

Can't find it online, though...