How many of the following statements regarding the drainage system of Haryana are correct? 1. The Markanda river, an ephemeral stream, changes its name to the Aruna river after entering the state. 2. The Sahibi river originates in the Mewat hills and is a major tributary of the Yamuna, joining it near Okhla. 3. The Tangri river is a tributary of the Markanda river and originates in the Morni hills. 4. The Drishadvati river is generally identified with the modern-day Chautang river system. Choose the correct answer from the options given below:

Markanda

• The Markanda is a seasonal stream which rises in the lower Shivalik hills of Himachal Pradesh, where it is known as the Aruna, and it takes the name Markanda after entering Haryana near Ambala. The statement reverses the order of the change of name. Hence, statement 1 is incorrect.

Sahibi

• The Sahibi rises in the hills of the Aravalli system in the Mewat-Alwar tract and flows through Rewari, Jhajjar and Gurugram into Delhi, where it is known as the Najafgarh drain, and finally falls into the Yamuna. Hence, statement 2 is correct.

Tangri

• The Tangri rises in the Morni hills of the Panchkula district but it is a tributary of the Ghaggar and not of the Markanda. Hence, statement 3 is incorrect.

Drishadvati

• The Drishadvati of the Vedic texts, which along with the Saraswati formed the land of Brahmavarta, is generally identified with the present day Chautang. Hence, statement 4 is correct.
• Therefore, only two statements are correct.