| Tyao River | |
| Name Other: | Tiau River |
| Subdivision Type1: | Country |
| Subdivision Name1: | India, Myanmar |
| Subdivision Type2: | State |
| Subdivision Name2: | Mizoram, Chin State |
| Subdivision Type3: | District |
| Subdivision Name3: | Champhai, Falam |
| Length: | 159km (99miles) |
| Source1 Location: | Khuangphah |
| Source1 Coordinates: | 23.7125°N 93.4066°W |
| Mouth Location: | Kaladan River |
Tyao River(or Tiau River, Tio River) a 159km (99miles) long river that flows between the Mizoram state in India and the Chin State in Myanmar, forming part of the international boundary between the two countries.[1]
It rises near Khuangphah village of Champhai district in Mizoram, India. It ultimately merges with the Kaladan River (Chhimtuipui river).[1]
The twin towns of Zokhawthar in Mizoram and Rikhawdar in Chin State are on the banks of the river. There is an official border crossing between the two towns.[2]