One of the most important rivers in the district is the Doyang river. It is the longest and biggest river running near the state’s southern boundary. The Angami people call it Dzu or Dzulu in whose area it rises. It first flows almost due north, when it obtained an addition of Saju, an eastward parallel tributary, slightly turn towards east. Still flowing northwestward, the river then enters the Zunheboto district. Between Sema and Lotha areas, it, later on, forms a boundary line. It makes a westward bend in the west of Litami and emerged in the western Lotha area in Wokha district, and proceeds to the southern border of the district, for the plains west of Koro village and then finally falls in the Dhansiri river of Assam valleys, it suddenly turns westward and then debouches the hills.