History:

In 1989, the area was moved from the West Cyan district to East Cyan. Ten years later, in 1999, the district was divided into the Upper Cyan district. The East Cyan district has a long ancient history associated with the Kingdom. It was probably under the control of the chief for a long time and was under the control of Bilpal in the 12th century. Pasighat is the headquarters of the East Siang district in Arunachal Pradesh, India. Located at the eastern foot of the Himalayas, 155 meters above sea level, Pasighat is Arunachal's oldest town. 

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The name of the district comes from the powerful Brahmaputra River, known as the San River in Arunachal Pradesh. Mainly inhabited by the Adi people of Arunachal Pradesh.

Area: 

The total area of ​​the district is 8325 km2.

Subdistricts: 

The Shan has a total of four subdistricts.

Villages:

There are 112 villages in this area.

Towns:

There are only three towns in this area.