Nahan is a town in Himachal Pradesh in India and is the headquarters of the Sirmaur District. It was the capital of the former Sirmur princely st…Nahan is a town in Himachal Pradesh in India and is the headquarters of the Sirmaur District. It was the capital of the former Sirmur princely state. Nahan is also known as the "town of ponds". Nahan is located at 30°33′N 77°18′E / 30.55°N 77.3°E. It has an average elevation of 932 metres.