What are the three main physical regions of Arunachal Pradesh?

Arunachal Pradesh is characterized by a mountainous landscape that encompasses three broad physiographic regions, rising from the south to the north:1

• Foothills: Located in the farthest south, this region consists of a series of hills similar to the Siwalik Range. These hills ascend from the Assam plains to elevations between 1,000 and 3,300 feet (300 to 1,000 meters).1
• Lesser Himalayas: Situated north of the foothills, this region rises rapidly in elevation, with various ridges and spurs reaching up to 10,000 feet (3,000 meters).1
• Great Himalayas: Located farthest north along the border with Tibet, this region contains the state's main mountain ranges. It is dominated by Kangto, the highest peak in the state, which reaches an elevation of approximately 23,260 feet (7,090 meters).1