The Dibang River flows through the Indian state of Arunachal Pradesh. The river goes through its middle course across the Lower Dibang Valley District of Arunachal Pradesh. The Dibang River is an important tributary of the Brahmaputra. The Dibang River and Lohit River merge together and flow along the northern side of the Saikhowa Reserve forest. Iphipani Ghat is 10 km from the Roing Township and is situated very close to the river. The famous Bhismaknagar Fort stands at the foothills of the mountains between the Dikrong and the Dibang rivers. The Mishmi Hills is found along the upper courses of the Dibang River.

The demographic area type of Dibang River Valley is Hydrographic. The exact location of the origin of this river is 27° 49` 60 N and 95° 31` 60 E. The region all along the upper course of the river is located in the Great Himalayan Mountain Range, with its northern and eastern reaches bordering Tibet. The Mishmi Hills is the southward expansion of the Himalayas; compose most of the northern part of the region. They have an average elevation of 15,000 feet (4,500 m) and are dotted with passes such as Yonggyap at 13,000 feet (3,950 m) and Kaya at 15,600 feet (4,750 m). The region derives its name from the Dibang River. The Dibang, along with other rivers like Ahui, Adzon, Emra, and Dri streams flows southward to join the Brahmaputra River. Subtropical evergreen forests of oak, juniper, maple, and pine cover the hilly vegetation of the region.

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