The Kalimpong Wool Route: Nepal's Lhasa Trade via Nathu La & Jelep La

For most of its history Nepal's trade with Tibet crossed the high passes directly north of the Kathmandu Valley, above all Kuti (Nyalam) and Kyirong (Gyirong). After the British annexed the Kalimpong tract from Bhutan and, from 1884, began pushing a cart road toward the Jelep La pass, a new and easier corridor opened along the eastern flank of the Himalaya. It ran entirely through British India and Sikkim, yet it carried a large share of Nepal's own Lhasa trade, making it in effect a seventh commercial corridor for Nepali merchants.

The turning point was Colonel Francis Younghusband's British military expedition to Lhasa of 1903-04, which forced its way up through the Chumbi Valley using Nathu La as its main line of communication. The resulting Anglo-Tibetan Convention of 1904 (BS 1961) opened trade marts at Yatung, Gyantse and Gartok and regularised commerce along the passes. From the 1930s the lower, gentler Nathu La and Jelep La crossings on the Sikkim-Tibet border eclipsed the older Nepali passes, and Kalimpong in West Bengal became the pivot of the whole Tibetan trade.

For the Newar merchants of Kathmandu, who had run business houses in Lhasa for centuries, this was a boon rather than a threat. They simply shifted their long-distance leg from the Nepal passes to the Kalimpong road, keeping their kothis (trading houses) in Lhasa while sending goods down to Calcutta through Gangtok and Kalimpong. The half-century that followed, roughly 1904 to 1962, is remembered as the last golden age of the Lhasa Newar.

The journey was a slow, disciplined relay of pack animals. From Lhasa the road ran south-west to Gyantse, Tibet's third city and a British trade mart, then down the Chumbi Valley to Yatung (Yadong) near the frontier. From there caravans climbed to the watershed passes and dropped into Sikkim and Bengal. The full trip between Lhasa and Kalimpong generally took about three weeks, with mule trains covering fixed stages between established rest-houses and serais.

Two passes carried the traffic across the final barrier. Nathu La, at about 4,310 metres (14,140 feet), lay roughly 52 to 54 kilometres east of Gangtok and some 35 kilometres from Yatung, and it fed the Gangtok road. Jelep La, slightly higher at about 4,386 metres (14,390 feet) and a few kilometres to the south, funnelled its caravans directly toward Kalimpong. A large mule caravan of around 200 animals typically needed 20 to 25 days for the Gangtok-to-Lhasa leg alone.

The cargo was heavy and bulky. Down from the plateau came raw sheep's wool above all, together with borax, musk pods, yak tails, hides, salt and gold dust; up toward Lhasa went cotton cloth and other Indian and British factory goods, tobacco, rice, kerosene, sugar and manufactured wares. The mules were the engine of it all, and in the trading season they moved in strings sometimes numbering in the hundreds.

Kalimpong was where the caravan trade turned into an export business. Mule trains, sometimes in the hundreds, delivered raw wool to the town, where it was weighed, sorted for quality and packed for onward shipment. The great warehouses that held it were known locally as 'Unn Godam' (from unn, wool, and godam, godown or store), and the trading quarter around the Tenth Mile grew into a cosmopolitan bazaar of Tibetan, Newar, Marwari, Bhutia and British firms.

From these godowns the wool was carried down to Kolkata (Calcutta), then British India's premier port, and re-exported to the mills of England and beyond. Wool was overwhelmingly the dominant commodity, and its trade wove new economic and political ties between Tibet, the British Raj and the wider world. It is this dominance that gives the corridor its proper name: although outsiders sometimes call it a 'silk route', it was in truth a wool route.

The scale was remarkable for so remote a town. By 1924 (BS 1981) about half of all trade between Tibet and India was passing through the Bengal-Lhasa route via Kalimpong, and the town flourished on this frontier commerce for roughly five decades. Fortunes were made in the godowns, and much of the wealth that built Kalimpong's villas, schools and monasteries came directly from the wool bales stacked in its warehouses.

At the Lhasa end of the route stood the Nepali merchant community that gave Nepal its stake in the trade. These were the Lhasa Newar: expatriate Newar traders and artisans from the Kathmandu Valley, many of them Tuladhars and other trading castes, who had maintained business houses in Tibet for centuries. Their permanent bases were the kothis, hereditary trading houses clustered around the Barkhor, the great circular market and pilgrimage street ringing the Jokhang temple in the heart of Lhasa.

A well-known example was the Ghorasyar house, which functioned as a hub for coordinating trade among Newar merchants, exchanging goods and moving money. Remittance was handled through the hundi system, an informal bill-of-exchange network that let a merchant deposit cash in Lhasa and draw it in Calcutta without physically carrying silver over the passes. Salaried banja staff ran the day-to-day buying and selling in the Barkhor while the caravans shuttled goods between Lhasa, Shigatse, Gyantse, Kalimpong and Kolkata.

The community's institutional life was formalised over time, including a Nepalese Chamber of Commerce in Lhasa, and its story was later recorded in detail by Kamal Ratna Tuladhar in 'Caravan to Lhasa: Newar Merchants of Kathmandu in Traditional Tibet' (2004), drawn from his own family's memories. For these families the Kalimpong wool route was not a foreign road but the lifeline of a thousand-year-old trans-Himalayan business.

The corridor was as much a work of imperial engineering and diplomacy as of commerce. After Kalimpong passed to British control, the construction of a cart road toward Jelep La from 1884 (BS 1941) alarmed the Tibetans, who saw it as a highway for foreign penetration. In 1886 a small Tibetan militia occupied ground near the pass, and in May 1888 (BS 1945) Tibetan forces clashed with the British before being pushed back and the frontier restored by that September.

The decisive intervention came with the Younghusband expedition of 1903-04, a British force of over a thousand fighting troops backed by many thousands of porters and pack animals, which marched to Lhasa and imposed the 1904 Convention. That treaty, and the Anglo-Chinese and later Simla arrangements that followed, gave Britain the trade marts, the telegraph and postal links, and the small garrisons that made the Chumbi-Kalimpong road safe and predictable for merchants.

The effect was to knit a remote Himalayan track into a global supply chain: Tibetan pastures, Bengali warehouses and English textile mills were joined by a single line of mules and railway wagons. For Nepali traders it meant that their Lhasa business now depended not only on the weather of the passes but on the politics of Calcutta, Gangtok and, ultimately, Beijing and Delhi.

The route did not fade away; it was cut. Through the 1950s trade actually surged as roads improved, but relations soured after China's consolidation of control in Tibet, and by 1959 Chinese restrictions on Indian and Nepali traders were creating friction near the passes. The Sino-Indian War of October-November 1962 (BS 2019) brought open fighting in the Chumbi Valley sector, and in its aftermath both Nathu La and Jelep La were closed.

For the Lhasa Newar this was the end of an era. The thousand-year-old tradition of Newar merchants living and trading in Tibet came to a close once the caravan route through Sikkim was shut. The kothis on the Barkhor emptied, the hundi network collapsed, and families who had shuttled between Kathmandu, Lhasa and Calcutta for generations came home for good.

Kalimpong's wool godowns fell quiet almost overnight, and the town's economy had to reinvent itself around education, horticulture and tourism. The passes stayed sealed for more than four decades. Nathu La was partially reopened for limited border trade on 6 July 2006 (BS 2063), but it never recovered its old role, and Jelep La remains closed. The great wool route survives today only in memory, in family histories, and in the empty warehouses of the Tenth Mile.