Which physical feature acts as a watershed between the Indus and the Ganges rivers?

Correct answer: None of the above. The watershed between the Indus and Ganges systems is the low Delhi–Ambala divide, not a major mountain range.

Background: The divide lies on the plains between Delhi and Ambala.

• Karakoram: The Karakoram is a mountain range that feeds the Indus.
• Hindu Kush: The Hindu Kush is a mountain range in the west.
• Himalaya: The Himalaya is a mountain range that feeds both systems.

Did you know? It is a very gentle ridge compared with the great mountain ranges.

Memory trick: Indus–Ganges divide = low plains ridge.