Answer: Kali
Notes: The Kali River, a tributary of the Ghaghara, delineates the border between Nepal and India. This boundary was formalized by the Treaty of Sugauli in 1816, following the Anglo-Nepalese War. The region around Kalapani has been a subject of territorial disputes, highlighting the historical complexities of Indo-Nepal relations. The river is significant for both countries, serving as a vital water source.
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