Ratnakūṭa (रत्नकूट) is the name of an island to which Śaktideva and Satyavrata traveled to according to the “story of the golden city”, according to the Kathāsaritsāgara, chapter 26. Accordingly, Satyavrata said: “… there is a fair isle in the middle of the sea named Ratnakūṭa, and in it there is a temple of the adorable Viṣṇu founded by the Ocean, and on the twelfth day of the white fortnight of Āṣāḍha there is a festival there, with a procession, and people come there diligently from all the islands to offer worship. It is possible that someone there might know about the Golden City”.