Ana Sagar Lake, Artificial lake in Ajmer, India

Ana Sagar Lake is an artificial lake in Ajmer, built by Arnoraja in 1135–1150 AD and named after him. Its water is bordered by walkways and a low beige stone balustrade with rounded pillars; small boats with people sit on the greenish-grey surface, and a rocky brown hillside topped by pale sandstone and white flat-roofed buildings rises across the water.

Arnoraja, also called Ana and grandfather of Prithviraj Chauhan, had the lake built between 1135 and 1150, and it is named after him. Local people helped construct its catchments. Jahangir later laid out Daulat Bagh beside the water, and Shah Jahan added five marble pavilions, the Baradari, between the garden and the lake.

The lake is named after Arnoraja (Ana), the Chauhan ruler and grandfather of Prithviraj Chauhan, who built it. On its bank lies Rishi Udyan, where the ashes of Dayananda Saraswati were scattered; its Arya Samaj temple holds morning and evening yajna homa and a three-day Arya Samaj mela each year at the end of October, with Vedic seminars and a flag march.

The site is easily accessed from the eastern side where the gardens and pavilions concentrate. Visitors should come in late afternoon when the sun is less intense, and wear appropriate clothing for sun protection.

Along the bank stands the Rishi Udyan Park where annual traditional ceremonies take place and people gather. This park is less known than the pavilions but is regularly used by locals for special occasions.