The highest peak in the state is Kangto, at . Nyegi Kangsang, the main Gorichen peak, and the Eastern Gorichen peak are other tall Himalaya peaks. The state's mountain ranges, in the extreme East of India, are described as "the place where the sun rises" in historical Indian texts and named the Aruna Mountains, which inspired the name of the state. The villages of Dong (more accessible by car, and with a lookout favoured by tourists) and Vijaynagar (on the edge of Myanmar) receive the first sunlight in all of India. thumb|A view from Bhalukpong, a small town by the southern reaches of the Himalayas. Major rivers of Arunachal Pradesh include the Kameng, Subansiri, Siang (Brahmaputra), Dibang, Lohit and Noa Dihing rivers. Subsurface flows and summer snow melt contribute to the volume of water. Mountains until the Siang river are classified as the Eastern Himalayas. Those between the Siang and Noa Dihing are classified as the Mishmi Hills that may be part of the Hengduan Mountains. Mountains south of the Noa Dihing in Tirap and Longding districts are part of the Patkai Range.
The highest peak in the state is Kangto at . Nyegi Kangsang, the main Gorichen peak, and the Eastern Gorichen peak are other tall Himalaya peaks. The state's mountain ranges, in the extreme East of India, are described as "the place where the sun rises" in historical Indian texts and named the Aruna Mountains, which inspired the name of the state. The villages of Dong (more accessible by car, and with a lookout favoured by tourists) and Vijaynagar (on the edge of Myanmar) receive the first sunlight in all of India. thumb|A view from Bhalukpong, a small town by the southern reaches of the Himalayas. Major rivers of Arunachal Pradesh include the Kameng, Subansiri, Siang (Brahmaputra), Dibang, Lohit and Noa Dihing rivers. Subsurface flows and summer snow melt contribute to the volume of water. Mountains until the Siang river are classified as the Eastern Himalayas. Those between the Siang and Noa Dihing are classified as the Mishmi Hills that may be part of the Hengduan Mountains. Mountains south of the Noa Dihing in Tirap and Longding districts are part of the Patkai Range.