Where are the largest farming areas on the Plateau of Tibet located?

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The most extensive farming on the Plateau of Tibet is concentrated in the great valley of southern Tibet. This primary agricultural region stretches approximately 1,000 miles (1,600 km) from the upper Indus River valley in the west to the valley of the upper Brahmaputra River.12

These fertile plains and valleys serve as the hub for most of the region's agriculture, animal husbandry, and industry, supporting major population centers such as Lhasa, Xigazê, and Gyangzê.12