Borasu Pass

Borasu Pass (also spelled Bara-su Pass) is an ancient, formidable, and high-altitude alpine crossover pass in the Himalayas, standing at an audited elevation of 5,450 metres (17,880 feet) above sea level. Located at coordinates 31.1833° N and 78.4333° E, the pass commands an ice-bound saddle on the high mountain divide separating the cradle-shaped Har Ki Dun valley in the Garhwal Himalayas (Uttarakhand) from the breathtaking Baspa (Sangla) Valley of Kinnaur in Himachal Pradesh.

For centuries before the development of modern roads, Borasu Pass was the traditional trade artery connecting the remote shepherds and villagers of the Tons valley with the Kinnauri communities of Chitkul and Sangla. Traders crossed this high, glaciated notch laden with wool, salt, and grain. The pass is flanked by colossal glaciated massifs soaring past 6,000 metres, with the prominent pyramidal horn of Mount Swargarohini (6,252 m) dominating the southern horizon.

The trek spans 7 to 8 days, departing from the roadhead at Sankri (1,950 m) in the Govind Pashu Vihar National Park. Passing through traditional wooden villages like Taluka, Gangad, and Osla, trekkers hike into the legendary valley of Har Ki Dun (3,566 m). Beyond Har Ki Dun, the route enters an untamed wilderness, following the Maninda stream past the tranquil alpine tarn of Maninda Tal to camp at Ratho and Borasu Base Camp (4,800 m).

The summit day requires a pre-dawn climb across active moraines, boulder scree, and steep snow gullies to reach the windswept notch of Borasu Pass at 17,880 feet. The northern descent drops down through loose shale, moraine fields, and snow patches into Himachal Pradesh, concluding at the picture-postcard border village of Chitkul (3,450 m)—celebrated as the last inhabited village on the Indo-Tibetan border in Kinnaur.

Managed under the eco-tourism guidelines of the Govind Pashu Vihar National Park and the Himachal Pradesh Forest Department, the Borasu Pass route is one of the classic trans-Himalayan crossover adventures.

Trekkers must travel equipped with microspikes, ice axes, certified alpine guides, and warm mountaineering tents to negotiate the glaciated terrain safely.

Steep snow gullies leading to the pass crest can be hard and icy in early summer. Microspikes and trekking poles provide vital traction.

Loose scree and shifting rocks on the descent into the Baspa valley require careful foot placement. Wear climbing helmets.

Borasu Pass is accessible only on foot. Taxis and private passenger cars can reach Sankri from Dehradun, and meet trekkers at Chitkul on paved roads.

The exit drive from Chitkul through Sangla and along the Sutlej River highway (NH5) completes a grand inter-state Himalayan tour.

Trekkers must register and pay national park entry fees at the Sankri forest checkpost in Uttarakhand.

Registration is required at the Indo-Tibetan Border Police (ITBP) checkpost in Chitkul upon completing the trek.

The optimal trekking seasons are late May to June (for snowfields and snow slides) and September to mid-October (for golden meadows, crisp skies, and stable weather).

Monsoon brings heavy rain and landslide risks, while winter (November to May) buries the pass under 15 to 20 feet of snow.

The legendary valley of Har Ki Dun, revered in Hindu mythology as the valley through which the Pandavas ascended to heaven, is one of the most stunning alpine valleys in India.

Chitkul village in Kinnaur, with its picturesque slate-and-wood houses, Buddhist temples, and crystal-clear Baspa River, provides an idyllic conclusion to the trek.

Borasu Pass is the premier inter-state trekking crossover connecting the Garhwal Himalayas of Uttarakhand directly with the Baspa Valley of Kinnaur in Himachal Pradesh.