Off the top of my head, I know that Tangor is a jungle region (kingdom?) on the southern border of the Thonian Empire and, for the Emperor, is a bit of a thorn in the side, perhaps just as like Blackmoor is, but on the northern border.
I also know that its inhabitants are called Tanogoro.

Is there anything else interesting in Tangor (canon or fanon)?
Could it become the scenario for the adventures of a Blackmoorian hero, perhaps on a diplomatic mission?

Thanks! :)