Longro La: Driving the unpaved military track of the Sumdorong Chu Valley

Hidden away in the eastern Himalayas, Longro La—also known as Langro La or Lungro La—is a seriously high international mountain pass, topping out at 4,340m (14,238ft). You'll find it straddling the border between Arunachal Pradesh (India) and Tibet (China), a silent witness to some intense geopolitical stuff.

Tucked into the remote Sumdorong Chu Valley, this road is seriously remote and sensitive. For the adventurous, this is one of the toughest Himalayan routes. The "road" is often more of a suggestion, requiring some serious off-road driving. Because it's on the Indo-China border, expect heavy monitoring and you'll need a special permit just to get close.

The route stretches 70 km (44 miles) north to south, connecting Zemithang (India) with Khinzemane. Forget pavement—it's all unpaved, demanding expert mountain driving skills. As you climb, the lack of oxygen above 4,300 meters will push your vehicle to its limits, sapping its power on the steepest climbs.

Expect hairpin turns and loose gravel, making it prone to landslides during monsoon season and heavy snow in winter. If you're renting a vehicle, make sure your driver is a pro at handling snow and navigating high altitudes. There are zero services along this 70km stretch, so total self-sufficiency is a must.

Thanks to the altitude and location, Longro La is closed most of the year due to heavy snow. Winter temps can be deadly, making the pass impassable even for military vehicles. The weather can change in a flash – a clear morning can quickly turn into a blinding whiteout. If you're attempting this, pack professional-grade cold-weather gear, extra fuel, and oxygen.

Given its strategic importance, expect frequent military patrols. Respect the boundaries, as straying off-track can lead to detention. Longro La is an epic adventure for those craving the rawest Himalayas, but it leaves absolutely zero room for error or breakdowns.