The article then goes onto explain how the minotaurs attacked the gnolls...and were then defeated by the gnolls, but there are a couple of interesting facts in the above two paragraphs, that have not stood out to me before:Chris Pramas in Dragon Magazine Issue 289 wrote:The gnolls arrived in a lawless region well away from civilisation. Yet, even with reduced numbers, the veteran gnoll warriors were able to claim a section of the forest as a new base. Once established, they sent out rangers to survey the area. They discovered that several humanoid warlords were operating in the wild and that a strong nation rumored to be ruled by dragons dominated the south. The gnoll tribes having little to offer anyone but their battle experience, began to hire themselves out as mercenaries to the various warlords. They quickly established a reputation for bloodthirstiness and ruthless efficiency.
Once a warlord became completely dependent on the gnoll troops, he would be overthrown and his lands added to that of the tribes. Every year, gnoll numbers and territory grew, and they dubbed their new land Naresh, meaning "far home" in their native tongue. The gnolls showed little interest in Western Oerik, and it is unlikely that they would have turned their attention this way if not for the minotaurs.
- "The gnolls showed little interest in Western Oerik..." - This implies to me that "Western Oerik" might officially end at the mountain range that the gnolls crossed at the end of the Demon war,
- "...a strong nation rumored to be ruled by dragons dominated the south" - This implies there is a nation just east of Western Oerik that is not involved in the conflict that Chainmail is based around and
- "...several humanoid warlords were operating in the wild... " - This implies that the area that was eventually taken over by the gnolls was not part of the southern dragon-controlled nation.

Looking at the map, there are a couple of rivers that feed into a large delta area that feeds into the sea. There are forests all along the coasts west and east of that river. The forests even extend beyond a mountain range to another delta that is fed by a river that runs down from yet another mountain range.
That could be a pretty large size for a nation that was possibly controlled by dragons.
There is not too much to go on there, but this could be a way to add another nation for a tabletop game to explore.
Is there anything in Greyhawk canon about that region?