The Leh–Manali Highway is a 428 km (266 mi) long highway in northernmost India connecting Leh, the capital of the Union Territory of Ladakh, to Manali in the state of Himachal Pradesh. It crosses four passes Rohtang la, Baralacha la, lungalacha la, tanglang la. It connects the Kullu Valley of the upper Beas river to the Chandra and Bhaga river valleys of Lahaul via the Atal tunnel in Himachal Pradesh, then crosses over a series of high Himalayan passes into the Indus river valley in Ladakh. It is usually open for about six months a year from the first week of May when the snow is cleared from the highway to October when snowfall again blocks the high passes on the highway. Before the construction of the Atal tunnel, the highway used to remain closed beyond the Rohtang Pass during winter. With the completion of the proposed Shingo La Tunnel on an alternate route through Zanskar valley, targeted to be completed by 2025, the whole Leh-Manali route will become an all-weather road.

Leh is a city in Indian-administered Ladakh in the disputed Kashmir region. It is the largest city and the joint capital of Ladakh. Leh, located in the Leh district, was also the historical capital of the Kingdom of Ladakh. The seat of the kingdom, Leh Palace, the former residence of the royal family of Ladakh, was built in the same style and about the same time as the Potala Palace in Tibet. Since they were both constructed in a similar style and at roughly the same time, the Potala Palace in Tibet and Leh Palace, the royal residence, are frequently contrasted. Leh is at an altitude of 3,524 m (11,562 ft), and is connected via National Highway 1 to Srinagar in the southwest and to Manali in the south via the Leh-Manali Highway.