In its earlier history the region was agricultural.
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.
If you travel to a different region, you may find an idiom that you don't understand.
To the west of Lake Van, and close to the headwaters of the Murad Su, the eastern branch of the Euphrates, while the most easterly point is situated in a region about 42° 50' E., southward of the same lake.
This elevated region is known as the plateau of Matto Grosso, and its elevations so far as known rarely exceed 3000 ft.