Though Manu is reported to have sprung from Vivaswan,Surya,Sun, and recorded as first Human, Offspring of Saptha Rishis are shown as progenitors of Human race.For example Daksha.Saptha Rishis change for each Manvantara.
This Kingdom coexisted with the most ancient Kingdoms of India,that is the Mahajanapadas,the Sixteen Kingdoms of India,which is mentioned in the Vedas.
The astonishing fact is that it was a Republic.
Hindu Puranas and Epics describe various geographical locations in India and abroad(they a part of Bharatavarsha when these were composed)
It will be interesting and useful to know the current names of these places.
Here is a List.
The Purans distribute the Bharatvarsha as a part of Nine Divisions.
Ancient Name Present Name
1.Indra Dweep Andaman.
2.Naga Dweep Nicobar.