RAS question
Anas River is a tributary of which river?
Correct answer: (D) Mahi.
The Anas River is a left-bank tributary of the Mahi River.
Explanation
Anas belongs to the Mahi river system, not to the Chambal, Banas or Luni systems. The India-WRIS Mahi Basin Report lists Som, Anas and Panam among the main tributaries of the Mahi. Anas rises near Kalmora on the northern slopes of the Vindhyas in Jhabua district of Madhya Pradesh, flows north-west, and joins the main Mahi on its left bank in Dungarpur district of Rajasthan. Anas is also associated with the Banswara-Dungarpur belt, including the Mahi-Anas Ka Maidaan between the two rivers.
Why the other options are wrong
- (A) Chambal is wrong because Anas belongs to the Mahi river system and joins the Mahi, not the Chambal.
- (B) Banas is wrong because Anas is a tributary of the Mahi, not the Banas.
- (C) Luni is wrong because Anas is part of the Mahi basin, whereas Luni belongs to a different Rajasthan drainage system.
Concept
This tests Rajasthan drainage geography, especially the identification of tributaries within major river systems. Such questions recur in RAS because river systems connect physical geography with regional plains, districts and basin-based map work.