Yamuna flows along its eastern boundary. The ancient
Saraswati river was thought to have flowed through Haryana,
but it has now disappeared.
Ghaggar is Haryana's main seasonal river. The Ghaggar rises
in the outer Himalayas, between the Yamuna and the Sutlej
and enters Haryana near Pinjore, district Panchkula. Passing
through Ambala and Hissar, it reaches Bikaner in Rajasthan
and runs a course of 290 miles before disappearing into the
deserts of Rajasthan.
Markanda river's ancient name was Aruna. A seasonal stream
like the Ghaggar, it originates from the lower Shivalik
hills and enters Haryana near Ambala. During monsoons, this
stream swells into a raging torrent notorious for its
devastating power. The surplus water is carried on to the
Sanisa lake where the Markanda joins the Saraswati.
important tributary is the Tangri. The Sahibi originates in
the Mewat hills near Jitgarh and Manoharpur in Rajasthan.
Gathering volume from about a hundred tributaries, it
reaches voluminous proportions, forming a broad stream
around Alwar and Patan. On reaching Rohtak it branches off
into two smaller streams, finally reaching the outskirts of
Delhi and flowing into the Yamuna. There are three other
rivulets in and around the Mewat hills – Indori, Dohan and
Kasavati and they all flow northwards from the south.