Go to
http://zero-k.info/Maps & set filter to "Mountains" = There is 50+ official mountains map.
Imo there is no use to make categories more/too fine grained, sometimes that is even bad.
It is already very much matter of taste if maps are considered "flat/hill/mountains."
[Spoiler]'Eye of Horus' is tagged "mountains" but I to me it is just "Hills". Bots go almost everywhere, so by GF's definition it would not be "moutains" either.
More importantly just because a map has some steep, unpathable terrain does not always warrant the "mountains" tag.
Charlie_in_the_Hills is tagged "mountains", but in most matches the climber-only mountains at side are not really relevant. Unless you start on the 'eco hill' one can play perfectly fine with vehicles there.
FataMorgana: The "mountains" are imo not relevant enough to warrant that tag.
One word always comes up in terrain-rating discussions:
accessibilityTake "Lava Highgrounds": Is it flat? Is it hills? That does not really matter because the defining factor is obviously the large uncrossable lava areas.
Or a map like Knockout that is very flat, but just calling it "flat" does not really describe its character.
You could tag it with the new "cliffs/starcraft" category, but that does not really fit either.
Maps like Bluebend, Ravaged, Quicksilver, Heartbreaker are in this cliffs/starcraft style.
Putting map like Knockout in same category still misses the point a bit.
So instead of trying to rate accessibility via heightmap, accessibility should be its own category with options: 1) open 2) medium 3) inaccessible
accessibility could then also be useful not only for landmaps but also for more accurate rating of watermaps.