Khardung La, at an elevation 5359 m, is a high mountain pass located in the Ladakh region. The pass is located about 40 kms by road to the north of Leh and is the gateway to the Nubra valley. The high elevation pass is popular for adventurous motor bike expeditions. Hired vehicles (2 and 4-wheel-drive), heavy trucks, and motorcycles regularly travel into the NubraValley, though special permits may need to be arranged for travellers to make the journey.
Leh is connected by road from Manali and Srinagar, and daily flights are operated from Delhi. From Leh, a daily bus service to NubraValley passes over Khardung La. The ideal method to get to Khardung La is by taxi or bike. The two bases on either side of Khardung-la are North Pullu and South Pullu. Vehicles are allowed only in one direction at a time, from 9am - 1pm in the Leh - Khardongla Direction, and from 1 pm - 5 pm in the Nubra - Khardungla - Leh Direction. Sometimes it is one direction one day and the other direction the next day. Inner line permits are required to reach Khardung-la. These can be procured at the DC's office in Leh. Make sure to have photocopies of your permits, as each checkpoint needs a copy to be deposited with them. Source: wikipedia.