Defining culture

[Ghostman]

Horse or camel culture (especially if nomadic in origin) - pants, especially for men (from cavalry soldiers) like traditional Steppe, Persian dress

A great deal depends on what kind of domesticable animals are available in the region. Camels for example where not originally found in northern Africa, they were imported from Arabia.

Little water and food supply - smaller villages, nomads, large population centres are around any lakes, rivers (especially deltas) and seasides

Not to mention oases!

Walls - none, open landscape makes for far vision, distant villages, only walls are made to keep livestock or mounts together - except for forts/castles

So long as they have reasonable access to stone, you can bet there'll be walls to any settlement of importance. It's no good when bandits can just ride into your town...