$ bin/terrain --help
Usage of bin/terrain:
-cliffs int
percentage probability a cliff will randomly appear (default 15)
-elev int
levels of elevation on the map (default 9)
-height int
height of the map (default 16)
-peaks int
percentage probability a peak will randomly appear (default 5)
-steps
show the generation steps
-width int
width of the map (default 16)