 First of these, the Doda, has its source near the Pensi-la mountain-pass and flows south-eastwards along the main Zanskar valley leading towards Padum, the capital of Zanskar.The second branch is formed by two main tributaries known as Kargyag river, with its source near the Shingo La , and Tsarap river, with its source near the Baralacha-La.These two rivers unite below the village of Purne to form the Lungnak river (also known as the Lingti or Tsarap).