Landscape as fate
The western landscape — the desert, the mountain range, the open plain — is not backdrop but participant: it shapes what characters can do, determines where they must go, and imposes consequences that override human will. Writing landscape as fate requires understanding the specific physical logic of the specific terrain and building the plot around it rather than over it: the canyon that limits the chase to two possible exits, the water source that determines where the town must be built and who must come there, the mountain pass that closes in winter and makes the confrontation happen before spring. The landscape should feel like it has been in the story longer than any of the characters — like it was there before and will be there after — and the characters should move through it with awareness of that precedence.