Is it possible that he was from an island near the peninsula or the Northern Continent?Also, I do still believe the peninsula could work, since it's part of an island... But that's up to you, I guess.
But BS01 user Maxim21 found another post indicating that Nidhiki came from the peninsula:
Lord Rahl, 2008-08-14 19:52Hey Greg. I just had an idea. We don't know where Nidhiki's from, but it's somewhere that Toa either attack from the shadows, or they don't live to attack at all. To me, that sounds awfully like the Tren Krom Peninsula. So, my question is, was Nidhiki from the Tren Krom Peninsula?Yes, he was
So, was Nidhiki originated from the peninsula or not?
Yes, he was.