Nagmandir is located at Singchung block under West Kameng district of Arunachal Pradesh. The place is 135 KM form Tezpur (Assam) beside Kameng River.
History of Nag Mandir: During early sixties while the construction work between Bhalukpong – Tawang was in progress under project TUSKAR (later renamed as project Vartak), a couple of Nag (Cobras) were frequently seen on the spot and they used to go to the hill top drinking water (stagnated water collection was available on the hill top) and come down off and on. One day one of the man engaged on the road work killed the male Nag. After that it is told that bad times started for the group, the rocks and stone started falling down and as a result virtually the road work came to stop and it become a matter of concern, snakebites had become frequent probably due to the snakes disturbed by road building.
The female nag was too furious and wandering here and there cursing the killer of the male Nag. To propitiate the aggrieved female nag the Nag Mandir was made at the location. The Mandir is administrated by the successor units in charge of the sector. Major K Ramaswamy, OC of 984 engineer works section (later reorganized as 91 RCC) established the temple in its present shape and formed in 1966. After that a large scale construction and renovation have been carried out every year by 91 RCC (GREF).
The Mandir, since its inception, has earned wide range importance and serenity and has stood like a savior for all local population and the road users. On nagpanchami day, in every year a big pooja and mela is held and devotees from far off places visit the mandir and join in Bhandaras organizes by 91 RCC (GREF) on the occasion at site and greeting blessings from the Nag Baba.