Naimisaranyam is located at the junction of the roads from Sitapur and Khairabad, 20 km from Sitapur and 24 km from the Sandila railway station. 45 km north of Lucknow in Uttarpradesh. Naimisaranya is also known as "Nimsar" or "Nimkhar" and is located on the left bank of the river Gomati.
Thirumangai Alwar who is the only alwar who has done the Mangalasasanam on this sthala perumal explains about the life led by the human.
This kshetram is said to be one of the 8 swayam Vyaktha kshetrams. The other swayam Vyaktha kshetram are Sri Rangam, Srimushnam, Salagramam, Thotadri (Vaanamamalai), Tirupathi, Pushkaram and Badri.
This Naimisaranya kshetram is said to be regarded as "Tapovanam". There are 9 tapovams. They are Dandakaranyam, Saindhavaranyam, Jambhukaranyam, Pushkararanyam, Utpalaranyam, Badrikaranyam, Gurujangalaranyam, Aruputharanyam and Naimisaranayam. It is belived that the perumal is found in the form of forest. And this Naimisaranyam is regarded as a holy forest.