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|Elevation||205 m (673 ft)|
|Time zone||IST (UTC+5:30)|
Diyun a small township on the rise, is located in Changlang District of Arunachal Pradesh. It got its name from a very small seasonal river by the same name. It is located at 27°31'28"N and 96°8'33"E, geographically. It is surrounded by the foothills of the Eastern Himalayas on two sides and by the Patkai Bum Range of mountains on one side. 
Diyun Circle is mostly populated by the Chakma tribe.
As such the local administration didn't do much for the development of Diyun Bazaar. The condition of infrastructure is worrisome. It Take almost 2 hours to reach Diyun from Namsai, India which is only 32 km. Another infrastructure parameter electricity, which though present but would be better without it. Since the last 20 years the capacity of the Diyun transformer was not changed or augmented. With the rapid increase in population of Diyun with the building of IRBN Headquarters, EAC office, BDO office along with the electrification of peripheral villages, The consumption of electricity has increased manifold. But the transformer was never augmented to carry the load. There is 5–10 hours of load shedding daily. The people of Diyun are Buddhists. They have been following Buddhism since a long time.
Arunachal Chakma News is the only newspaper which is published in Diyun circle by the Chakma Community which was established in 22 September 2012.