Which rivers’ valleys are divided by the Hindu Kush?

The Hindu Kush mountain system serves as a major watershed in Central Asia, effectively dividing the valley of the Amu Darya (the ancient Oxus River) to the north from the Indus River valley to the south.1

Additionally, within the central section of the range, the mountains separate the traditional Afghan regions of Badakhshān to the north from the areas surrounding the upper Kābul River to the south.2