Donkia La Pass

Donkia La Pass (also spelled Dongkya La) is the supreme high-altitude mountain crossing in Sikkim, standing at an audited altitude of 5,537 metres (18,166 feet) above sea level in the far northern reaches of the Dongkya Range. Located at coordinates 27.9667° N and 88.7500° E in the North Sikkim district, the pass crowns the glaciated continental threshold connecting the lush, rhododendron-filled Lachung and Yumthang valleys with the vast, windswept high plateau of western Tibet.

What elevates Donkia La into global legendary status is its proximity to Tso Lhamo Lake (Cholamu Lake)—officially recognized as the highest lake in India, situated at 5,330 metres (17,490 feet). Revered as the sacred maternal source of the Teesta River, Tso Lhamo's crystal-clear emerald-blue waters shimmer in an ethereal cold-desert basin surrounded by rolling ochre hills. From the summit of Donkia La, the view unfolds across an endless expanse of the high Tibetan plateau, with distant snow-dusted massifs fading into the northern horizon.

The expedition to Donkia La departs Gangtok, traveling north along the Teesta gorge past Mangan and Chungthang to the high alpine base of Lachen (2,750 m) or Lachung. Beyond the military checkpoint at Thangu (3,960 m), the tree line terminates abruptly and the landscape transforms into an expansive trans-Himalayan cold desert.

Passing through the high-security military post of Giagong (4,570 m), authorized vehicles navigate across rough moraine tracks and 26 steep switchbacks carved into loose scree and permafrost to reach the summit crest of Donkia La at 18,166 feet, looking down upon the sacred waters of Tso Lhamo and the nearby Gurudongmar Lake.

Developed and maintained by Project Swastik of the Border Roads Organisation under extreme conditions, the high border road to Donkia La is an extraordinary engineering accomplishment.

BRO snowclearing teams battle sub-zero blizzards and 20-foot snowdrifts each spring to keep forward military defense routes operational along the northern border.

Extreme hypoxia and rapid altitude shock represent severe hazards at 18,166 feet. Always spend at least two nights acclimatizing in Lachen or Lachung before attempting the trip.

The road is unpaved, featuring sharp moraine rocks that can slash tire sidewalls. Carry a heavy-duty tire inflator and two spare tires.

A robust 4x4 SUV with high ground clearance (minimum 210 mm) is mandatory for Donkia La. Standard passenger cars and low-clearance crossovers should never attempt this extreme route.

Only experienced local drivers familiar with high-altitude mechanics and cold-engine cranking should pilot vehicles in this sector.

Donkia La and Tso Lhamo are located in a highly restricted international border sector. Indian citizens require special Protected Area Permits issued by the SDM Chungthang and endorsed by the Indian Army.

Foreign nationals, OCI, and PIO cardholders are strictly prohibited beyond Thangu. Strict document verification occurs at Thangu and Giagong.

The pass is accessible to authorized expeditions for a brief window from late June through mid-October. July and August offer the best weather, while September provides crystal-clear blue skies.

From late October through May, intense winter freezes and massive snowdrifts seal the pass completely.

The sacred Tso Lhamo Lake (5,330 m), the highest lake in India and the source of the Teesta River, is an ethereal, divine sight that few travelers on earth ever witness.

Nearby lies the world-famous Gurudongmar Lake (5,430 m), blessed by Guru Padmasambhava and Guru Nanak, completing a sublime high-altitude pilgrimage.

Donkia La is the crowning summit of the North Sikkim Grand Circuit, combining Lachen, Gurudongmar Lake, Tso Lhamo, Lachung, and the Valley of Flowers at Yumthang.