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The Leh–Manali Highway (Hindi: लेह-मनाली राजमार्ग Lēha-manālī rājamārga) is a highway in northern India connecting Leh in Ladakh in Jammu and Kashmir state and Manali in Himachal Pradesh state. It is open for only about four and a half months in a year in summer between May or June, when the snow is cleared by the Border Roads Organisation of Indian army, and mid-October when snowfall again blocks the high passes. It connects Manali valley to Lahaul and Spiti valleys and Zanskar valley in Ladakh. It is a part of NH 21.

Leh–Manali Highway was designed and built and is maintained entirely by the Border Roads Organisation (BRO). It is capable of supporting the heaviest of army vehicles.