Name and describe the major river systems in pakistan and bangladesh. how are the rivers a valuable resource for people in the subregion?

The major river system in Pakistan is that of the "Indus River" and that in Bangladesh is of the "Brahmaputra River". Both the river systems are ones of the "biggest river systems" in the world.

Explanation:

The Indus River that originates on the Tibetan Plateau flows through the entire mainland Pakistan to drain into the Arabian Sea. The Brahmaputra River originates on the Kailash Mountain in the "Himalayas" and drains into the "Bay of Bengal" after flowing its course through northeast India and Bangladesh.