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At the edge of the Himalayas, where the borders of Nepal, India and China meet at more than 5,000 metres, a 372 square kilometre wedge of high-altitude terrain has once again become the focal point of one of South Asia's most stubborn territorial disputes, but one that most New Zealanders have never heard of.
The Kalapani triangle, encompassing Kalapani itself, the Lipulekh Pass and the glacial source area of Limpiyadhura, has flared repeatedly over the past six years. In 2026, it has done so again, with a fresh diplomatic protest from Nepal.
A pilgrimage route reopens
The latest flashpoint goes back to April, when India's Ministry of External Affairs announced the resumption of the Kailash Mansarovar Yatra, the annual Hindu and Buddhist pilgrimage to Mount Kailash and Lake Mansarovar in Tibet. Ten of the pilgrimage's twenty scheduled groups of pilgrims were to travel via the Lipulekh Pass in coordination with Chinese authorities, along a trade route agreed last year by India and China, but without consulting Nepal.
Kathmandu's Ministry of Foreign Affairs responded within days, issuing diplomatic notes to both Delhi and Beijing reaffirming that Limpiyadhura, Lipulekh and Kalapani are, in its view, sovereign Nepali territory under the 1816 Treaty of Sugauli, and objecting to any trade, tourism or infrastructure activity in the area without Nepal's consent.
It was a familiar move: Nepal lodged near-identical protests when India and China first struck their Lipulekh trade arrangement in 2015, and again after New Delhi opened a military road through the pass in 2020.
A dispute rooted in an 1816 treaty
The origins of the row float in the mists of history, and the aftermath of the Anglo-Nepalese War of 1814-1816, which ended with Nepal's defeat and the signing of the Sugauli Treaty between the Kingdom of Nepal and the British East India Company.
The treaty fixed the Kali (or Mahakali) River as Nepal's western boundary , but it never precisely settled where that river begins, and colonial-era maps drawn in the decades that followed were often disputed.
Nepal argues the river originates at Limpiyadhura, which would place the entire triangle, including Kalapani and Lipulekh, inside Nepali territory. India contends the river's source is further east, at Kalapani itself, placing the disputed land within Uttarakhand state, which it has administered since the 1962 Sino-Indian war.
The dispute has periodically resurfaced ever since: in a 2000 field-survey agreement between Kathmandu and Delhi that ultimately went nowhere; in 2015, when Nepal objected to the first India-China trade pact; and most sharply in 2019 and 2020, when India published a new political map incorporating Kalapani, prompting Nepal to pass its own constitutional amendment redrawing its official map, and its national emblem, to include the disputed triangle.
India rejected the move outright, calling it an "artificial enlargement" of claims with no basis in historical fact.
The treaty Nepal cannot find
What has given the 2026 flare-up its distinctly awkward edge is a revelation from Nepal's own government. Responding to questions in the House of Representatives this month, Foreign Minister Shishir Khanal acknowledged that Kathmandu cannot actually confirm it holds the original, signed copy of the 1816 Sugauli Treaty , the very document underpinning its territorial claim.
Echos perhaps of the Treaty of Waitangi, the original draft of which lay forgotten in the basement of the OGB in Wellington for thirty years in the late 19th century.
The admission has triggered a political storm in Kathmandu and given commentators in Delhi an opening to question the durability of Nepal's legal position.
Analysts note, however, that a missing original does not by itself resolve the dispute, which also rests on subsequent administrative records and a shambles of conflicting colonial-era maps.
Balendra Shah's blunt diplomacy
Nepal's response has been shaped by relatively new leadership. Kathmandu mayor-turned-prime minister Balendra Shah and Foreign Minister Khanal took office after a political upheaval and the Gen Z-driven protests that shook the capital last year, and have staked out a notably assertive posture on sovereignty issues.
Yet Shah has also broken with the nationalist script, telling parliament in May that "not only has India encroached on Nepal's land, but Nepal has also encroached on India's land in multiple places," he revealed that Kathmandu had sent India a diplomatic note and received an agreement to form joint teams of historians and surveyors to examine the records.
Nepal has also raised the border question with China and, pointedly, the United Kingdom, given the dispute's roots in a British-era treaty. India has now firmly rejected any role for third parties, insisting the matter be settled between Nepal and India.
Where things stand
India's position has remained consistent: Kalapani is administered as part of Uttarakhand, and while Delhi says it is willing to let historians and technical experts examine the evidence, its "territorial stance is clear." Nepal, meanwhile, continues to press for bilateral talks rather than unilateral action by India and China, though it has stopped short of any move that would seriously disrupt relations with its far larger neighbours.
Underlining how unsettled the border remains more broadly, violent clashes broke out between Nepali villagers and Indian border personnel at Susta, another contested stretch of the frontier, earlier this month.
With roughly 98 percent of the 1,751-kilometre India-Nepal border demarcated, Kalapani-Lipulekh-Limpiyadhura remains one of the last, and most strategically loaded, unresolved pieces, and a reminder that in the Himalayas, questions of sovereignty can still swing on the location of a nineteenth-century river source, and the exact whereabouts of a two-century-old piece of paper.
-Asia Media Centre
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