The Tlawng River is one of the longest rivers in Mizoram, measuring 234 km in length or 185.50 km net displacement Between Zobawk village near LungleiTown to Bairabi It originates in Zopui Hill some east of Lunglei at an elevation of. After the confluence with Tut and Teirei River it eventually enters Cachar District. It is navigable by small boat up to Sairang.