I agree completely.
There's a perfectly good High Rock for medieval fantasy. If you really want it so bad, use that, rather than crap on existing province lore.
Whoever was doing the writing for Arena must of made a mistake.
You mean Daggerfall(?), Redguard and Morrowind? This wasn't a simple one time print on the pre-fleshed out lore game. This was released as a real book with Redguard, which I highly doubt they wouldn't bother to double check, AND was included in-game in the game they started to actually flesh out the lore.
Also, I've always believed Cyrodiil isn't a JUNGLE, merely less tame than a temperate forest. I could imagine vines climbing up the giant architecture.