Explanation:

Yamuna Nagar has the river Yamuna (its namesake) running through the district, which forms the eastern boundary with the neighboring Saharanpur district. This boundary is also a state boundary, as Saharanpur is in the state of Uttar Pradesh. The district also separates the Yamuna system from the Satluj river system.From Yamuna Nagar, Yamuna river enters plain area for the first time. The historical river Saraswati also originates from Adibadri, also located in the district. Towards its northern edge is a sub-mountainous region, which has more forest cover and lots of streams; it is the area where the river Yamuna flows out of the hills and into the plains. The northern boundary is also an interstate boundary with the state of Himachal Pradesh to the north. Sirmour in Himachal is the district to its north with the towns of Nahan and Paonta Sahib close to the boundary with Yamunanagar.To its west and northwest is Ambala district, and to its west and southwest is Kurukshetra district. To its south is Karnal.