Najafgarh is a town in the South West Delhi district of National Capital Territory of Delhi, India. It is one of the three subdivisions of the Southwest Delhi district. Najafgarh is located in south western part of Delhi sharing its territory with Gurgaon and Bahadurgarh, Haryana.

The Sahibi river, also called the Sabi River, is an ephemeral, rain-fed river flowing through Rajasthan, Haryana and Delhi states in India. It originates in the eastern slopes of the Saiwar Protected Forest (PF) hills in Sikar District, enters Jaipur district near the foot of these hills, and after initially flowing southeast and east turns northeastwards near Shahpura and continues further till it exits Rajasthan to enter Haryana and further drains into Yamuna in Delhi, where its channeled course is also called the Najafgarh drain, which also serves as Najafgarh drain bird sanctuary. It flows for 300 km of which 157 km is in Rajasthan 100 km is in Haryana and 40 km in Delhi.