Answer: Lahaul valley & Zanskar valley
Notes: The Border Roads Organisation (BRO) is set to build the Shinkun La Tunnel, spanning 4.1 km under the 16,580 feet high Shinku-La pass, linking Himachal's Lahaul valley and Ladakh's Zanskar valley. It will be the world's longest high altitude highway tunnel. Costing Rs. 1,681.5 crores, it promises all-weather connectivity to Ladakh, shortening routes to border areas. Expected to streamline transportation, it will also provide security against long-range artillery shelling or missile firings.
