The drainage system of Rajasthan is governed by the water divider line found in the central part of the state. This water divider line, along with the axis of Aravalli in the North, proceeds to the south of Sambhar Lake, and from here, it passes through a few kilometres away from Beawer, Deogarh, Kumbhalgarh and Haladighati of Udaipur and moves towards Udai Sagar.
Then it proceeds ahead and flowing in Sadri and Chhoti Sadri in South – east, and goes to Pratapgarh. The rivers of south-western side of this water divide drain into the Arabian Sea. Luni, western Banas, Sabarmati and Mahi are the main rivers among them. In the eastern part of the water divider, river Banas and its tributaries merge into Chambal.
Banganga also joins the river Chambal. From here, water of Banas and Chambal flows into Yamuna and Ganga rivers and finally drains into the Bay of Bengal. In this way, water divider divides the drainage system of Rajasthan into two parts, which are the drainage system of Bay of Bengal and the drainage system of Arabian Sea.