Nahan is situated on an isolated ridge in the Shiwalik hills, overlooking greenfields. Nahan is a well laid-out picturesque town, known for its cleanliness and dust free streets. Saint and princes are linked with the origin of Nahan. The city was founded as a capital by Raja Karan Prakash in 1621. Another version recalls a saint who lived with a companionable Nahar on the site where the Nahan palace now stands "Nahar" means a Lion and probably the town takes its name from this saint. Nahan situated at an altitude of 932 meters, is a good base for visits to the surrounding areas viz. Renuka, Paonta Sahib, Trilokpur temple and the Suketi Fossil Park. It has a pleasant climate throughout the year and is watered by man made lake and decorated with temples and gardens. It is the headquarter of Sirmaur district.
Renuka lake is situated at a height of 672 m and lies in Sirmour district. It is 123 km from Parwanoo, 60 km from Paonta Sahib via Sataun and 38 km from Nahan via Dadahu. With a circumference of 3214m, Renukaji is the largest natural lake in Himachal. Shaped like the profile of a reclining woman, this is regarded as the embodiment of the goddess Renuka. Near the lake's feet is another lake held sacred by Hindus, and is associated to a legend surrounding her son, the legendary sage Parshurama. Both have temples built around them and the main temple dedicated to Goddess Renuka is regarded to have been built overnight in 18th century. The lake lies in a long valley and surrounding slopes are covered with thick woods. The lake is full of colourful fish and other acquatic animals. The lake is surrounded by a wildlife sanctuary and a few other temples. Boating facility is available at the lake.