Ratnagiri is the site of a ruined mahavihara, once the major Buddhist monastery in modern Odisha, India. It is located on a hill in between the Brahmani and Birupa rivers in Jajpur district. It is close to other Buddhist sites in the area, including Lalitagiri and Udayagiri, and 100 km (62 mi) from the state capital Bhubaneswar and 70km from the former state capital Cuttack.

Jajpur is a district of Odisha state in eastern India. The Odisha Government carried out a re-organisation of districts of Odisha in 1993. The erstwhile Cuttack district was split into multiple districts with Jajpur being one of them. The district came into being on 1 April 1993.