Treaty of Sugauli — Nepal's Border Defined After Anglo-Nepalese War

Full Verified Record

Signed on 4 March 1816, the Treaty of Sugauli ended the Anglo-Nepalese War. Nepal ceded to the British East India Company: the entirety of Sikkim, Kumaon, Garhwal, and the eastern and western Terai strips. Nepal also agreed to: (1) permit a British Resident in Kathmandu, (2) not employ Americans or Europeans without British consent, and (3) withdraw from disputed border territories. Nepal retained its sovereignty — a crucial point — and the treaty explicitly recognised Nepal as an independent state. The treaty's Article 5 defines the Kali River as the western boundary, the source of the current Kalapani/Limpiyadhura dispute with India, which claims 'Kali' means a different river branch than Nepal does.

४ मार्च १८१६ मा हस्ताक्षरित सुगौली सन्धिले एंग्लो-नेपाल युद्ध समाप्त गर्यो। नेपालले सिक्किम, कुमाऊँ, गढवाल र तराईका पट्टीहरू ब्रिटिश कम्पनीलाई सुम्पियो। नेपालले आफ्नो सार्वभौमिकता कायम राख्यो।

Why it mattered

The Sugauli Treaty defined Nepal's modern borders and set the terms of its relationship with British India for over a century. Its ambiguity around the Kali River's source is the direct cause of the ongoing Kalapani territorial dispute between Nepal and India — a live geopolitical issue in 2026. The treaty also enabled Gurkha recruitment, which became a major part of Nepal's military and economic identity.