Question by scooter321x: Four tributaries join the ________ to help define the area known as the Punjab.?
A. Ganges River
B. Brahmaputra River
C. Yangtze River
D. Euphrates River
E. Indus River
Indus I think

Best answer:

Answer by brooks b
Yes, the Indus River is the western boundary of the Punjab region.

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