River Sarda drains in the Northern Plains of Uttar Pradesh. Before entering in the Plains, Sarda is known as

The Sarda river, also known as the Sharda or Saryu, originates in the Milam glacier of the Nepal Himalayas [1]. In its upper reaches, particularly before entering the Indo-Gangetic plains of Uttar Pradesh, it is known as the Kali or Mahakali river [3]. It flows along the Indo-Nepal border, where it serves as a natural boundary between Uttarakhand and Nepal [3]. The river descends from the mountains and enters the plains at Barmdeo Mandi in Nepal, widening above the Sarda Barrage; it is only below this point that it is primarily referred to as the Sarda [3]. Eventually, it flows southeastward into Uttar Pradesh and joins the Ghaghara river [3]. Other options like Bhagirathi and Pindar are part of the Alaknanda-Ganga system and are distinct from the Sarda.

Sources

1. [1] INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.) > Chapter 3: Drainage System > Do you Know? > p. 22
2. [3] https://www.britannica.com/place/Sarda-River