I just rolled a random map with our settings and converted it all to mountains. Our start location is somewhere near the middle of the map, but I forgot to delete the original Zulu settler/scout, so those ones are stuck in the mountains. You'll need to world builder a few things (including giving an AI room to settle to avoid winning a conquest victory when they all commit suicide on their mountains) anyways, since I made that before we settled.
Mansa Musa of Zululand in PB14 - with Aivoturso