In the map shown in the given figure, rivers labelled as 1, 2, 3 and 4 are respectively

The map identifies the major left-bank tributaries of the Ganga River in the Indo-Gangetic plain. Their geographical identification is as follows:

• 1 (Kosi): Located in the far east (Bihar), it is known as the "Sorrow of Bihar" due to its frequent course shifts and flooding.
• 2 (Gomati): The westernmost of the four, originating from Gomat Taal in Uttar Pradesh and flowing through Lucknow.
• 3 (Ghaghara): A major trans-boundary river flowing between the Gomati and the Gandak.
• 4 (Gandak): Located in Bihar, it flows between the Ghaghara and the Kosi, joining the Ganga near Patna.

The sequence 1, 2, 3, and 4 corresponds to Kosi, Gomati, Ghaghara, and Gandak. While their geographical order from west to east is Gomati (2), Ghaghara (3), Gandak (4), and Kosi (1), the question asks for the labels in the specific jumbled order 1-2-3-4 shown on the map.