In its earlier history the region was agricultural.
If you travel to a different region, you may find an idiom that you don't understand.
This policy did not allay the discontent of the Macedonian army, and when Alexander in the summer of 324 moved to the cooler region of Media, an actual mutiny of the Macedonians broke out on the way at Opis on the Tigris.
But he did not stop short in the region of what is usually termed physics.
This elevated region is known as the plateau of Matto Grosso, and its elevations so far as known rarely exceed 3000 ft.