List of princely states of British India (by region)
Before the partition of India in 1947, about 584 princely states, also called "native states", existed in India. These were not part of British India, the parts of the Indian subcontinent which were under direct British administration, but rather under indirect rule, subject to subsidiary alliances.
Source: Wikipedia — List of princely states of British India (by region) (CC BY-SA 4.0)