David Gordon wrote:
> I didn't manage to finish Niven's third book as I ground to a halt
> somewhere in the first third of the book,

The third Ringworld book, /The Ringworld Throne/? I don't blame you,
it's quite a come-down from the first two.

I hope you'll try the fourth, /Ringworld's Children/. It's a return to
greatness! And (unlike /Throne/) it's not overly long, either.

> so I don't know if the other maps were explored.

Not in the books, anyway.

> What beings are on some of the other maps not mentioned in the books?

The Other Great Ocean contains multiple maps of the Pak homeworld, used
as prisons for Protectors who rebelled against the group.

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Clear ether!
Lensman