Aspects of this topic are discussed in the following places at Britannica.
...is composed mostly of ridges that are prolongations of the Zagros Mountains; the ridges run southeast–northwest and are intersected by plains. Climatically, it divides into two regions: the garmsīr and the sardsīr. The sparsely settled garmsīr (hot climate) region lies at elevations up to 2,500 feet (750 m). It is humid on the coastal plain bordering the Persian Gulf;...
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