I have discovered this EWF and earlier city seems to have three distinct canonical locations:
In WF 15 it is shown both at the confluence of the Creek and the Stream and described as being Delecti's Isle.
In the GtG in the Second Council map it is the Skull Ruins.
In KoS it seems to agree with the map in WF 15 but not with Delecti's Ruins...
(All this to figure out what the Skull Ruins' history was).
I realize that real world city names sometimes migrate, and that this could have happened, particularly if the wyter was attached to something moveable. Still...
Regarding the Skull Ruins, it appears from the old HeroWars books that it was created during the Storm Age after Orlanth slew the Stone Dragon, which was courting his mother. It is one of the five locations associated with the Puppeteer Troop in Dragon Pass. The ruins are built on top of the skull... The trolls seem to find the ruins funny for some reason.
The fact that an otherwise unknown Earth culture was associated with Engoli Fort, a little north of it (WF 15) and shards with indecipherable writing were found in the area near the Fort suggests to me that an extinct people lived here. It's so close to the Storm steadings around Kero Fin, however, that I would think they would be a refugee people adopted during the Storm/Darkness Ages and later wiped out or assimilated.
Any theories or facts I'm missing...?
Edit: It also is not an area claimed by a Vingkotling or Heortling tribe in the Second Age period - it's a neutral area.