In ancient Indian historical geography, the name `Ratnakara` denoted the Indian Ocean. Ratnakara is a Sanskrit term that translates to "the creator of gems" or "the repository of jewels." The Indian Ocean, known for its rich marine resources and its importance in trade and navigation, was often referred to as Ratnakara in ancient Indian texts and literature.

It`s worth mentioning that while the Indian Ocean is the primary association with the term Ratnakara, it is possible that the term may have been used in different contexts or regional variations in ancient texts. However, the general understanding is that Ratnakara primarily referred to the vast expanse of the Indian Ocean.