Multiple choice At what point is the Brahmaputra River at its most shallow point? in a valley In the mountains At its mouth on the plains Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Brahmaputra River begins high up in the cold, dry Himalayas. Because it has not yet collected water from tributaries or heavy monsoon rains in this high-altitude region, it is at its shallowest and narrowest in the mountains.