| Tawang Chu | |
| Pushpin Map: | Bhutan#India Arunachal Pradesh |
| Pushpin Map Caption: | Confluence of Tawang Chu and Kholong Chu in Bhutan |
| Pushpin Map Relief: | 0 |
| Subdivision Type1: | Country |
| Subdivision Name1: | India; Bhutan |
| Subdivision Type2: | District |
| Subdivision Name2: | Tawang district (Arunachal Pradesh); Trashiyangtse and Trashigang |
| Source1: | Tsona Chu |
| Source1 Location: | Tsona County, Tibet |
| Source1 Coordinates: | 28.09°N 92.059°W |
| Source2: | Mago Chu |
| Source2 Location: | Tawang district, Arunachal Pradesh |
| Source2 Coordinates: | 27.855°N 92.283°W |
| Source2 Elevation: | 3360m (11,020feet) |
| Mouth: | Kholong Chu |
| Mouth Location: | Duksum, Trashiyangtse District, Bhutan |
| Mouth Elevation: | 1040m (3,410feet) |
| Progression: | Drangme Chu, Manas River |
| River System: | Brahmaputra |
Tawang Chu (Tawang river) is the main river of the Tawang district in Arunachal Pradesh, India. The entire district may be regarded as the basin of the Tawang Chu river. In addition, two south-flowing rivers from Tibet, viz., Tsona Chu and Nyamjang Chu, join the river within the district. The combined river flows west into Bhutan, where it progresses to the Manas River (tributary of Brahmaputra River) and flows into the Assam state of India.
Tawang Chu is formed by the joining of three rivers originating within the Tawang district: Goshu Chu, Dungma Chu and Gorjo Chu. These rivers merge near the village of Mago (27.6876°N 92.2072°W), after which the combined river is called Mago Chu. After Tsona Chu joins it, near Kyelatongbo at an elevation of 2240m (7,350feet), the combined river is called Tawang Chu. The river flows west towards Bhutan, passing by the Tawang town on its southern flank.[1] Near Jang, between Mago & Tawang, the Nuranang River joins Tawang Chu. Near Lumla, the Nyamjang Chu river originating in Tibet joins Tawang Chu.
Tawang Chu enters Bhutan after passing the Dudunghar Circle of the Tawang district. At Duksum, the river merges with the Kholong Chu river flowing from the north.[2] The combined river is called Drangme Chhu (or Manas River).