The Thunderlands are a particularly ancient forest in eastern Hellea. The region is inhabited primarily by centaurs and fey, and the Thunderlands is one of the few ancestral lands of the centaurs that remains under their control. Clearings in the old growth forest are the locations of centaur encampments and communities, largely isolated from the broader world.
Outside visitors to the Thunderlands are tolerated, though watched closely to ensure they do not attempt to settle in the forest. Though a rather uncommon event, on occasion the centaurs send out trading parties to the communities surrounding the Thunderlands.
No nation claims the Thunderlands. Keeping control of such a territory would be prohibitively difficult, and any attempts at development would provoke the anger of the centaurs and fey.