Correct Answer: Ambala

Solution : The correct answer is Ambala .

Ambala in Haryana is located in the region of the water divide between Indus and Ganga. Delhi Ridge serves as a watershed between the Indus and Ganga River systems. Rainfall in this region determines whether water flows eastward into the Ganga or westward into the Indus, influencing regional hydrology and agriculture. Malda Gap serves as the Water divide between the Ganga and Brahmaputra.