River Tlawng is located in close proximity to Tamdil Lake and is considered to be the longest river in Mizoram. It spreads out to about 185 km and is also called Katakha or Dhaleswari in the local language.
This river also promotes fishing activities and being surrounded by lush green environs and some very pretty scenic locales, this is another attraction one must visit on their trip to Kolasib.