Bara-lacha la also known as Bara-lacha Pass, or Bārā Lācha La, (el. 4,850 m or 15,910 ft) is a high mountain pass in the Zanskar range of Northern-India, connecting Lahaul district in Himachal Pradesh to Leh district in Ladakh. Rail-cum-road tunnels are being constructed under the Bara-lacha la, Lungalacha La (84 km north of Bara-lacha la) and Taglang La (171 km north of Bara-lacha la) to cater for the traffic on existing NH3 Leh–Manali Highway & under-construction Bhanupli–Leh line. The two headwaters of the Chenab River, Chandra and Bhaga, originate near the Baralacha Pass. The Bhaga river originates from Surya taal lake, which is situated a few of kilometers from the pass towards Manali. The Chandra originates from glacier in this region. The native name of Chenab, "Chandrabhaga", represents the union of Chandra and Bhaga rivers downstream. The pass also acts as a water-divide between the Bhaga river and the Yunam river. From Wikipedia