Explanation:

Code 2-3-1 is correct.

• Kalapani is the largest territorial dispute between Nepal and India, situated at a tri-junction with Tibet (China). The disagreement stems from the origin of River Kali, demarcated in the Treaty of Sagauli (1816). Nepal claims the river west of Kalapani as the main River Kali, originating at Limpiyadhura or Lipulekh pass, while India argues it originates from a rivulet named Pankhagad, defining the border differently.

Hence option 2nd is correct.