The largest city of Harnash outside of Gadenthor, Trecorvum is built into a set of three hills around the fork of a river, so that each hill sits on a different bank of the river. Long winding paths circle around the outside of each hill, with houses and shops built into the hills themselves. Large passages are carved through the hillsides which are well paved with flagstones, further houses and the like built into the cool earth.

Most of the parties which explore Gadenthor head out from this city. It would be the capitol, if the queens didn't have their throne in the now-floating ruins. Certainly it is where a lot of the wealthier members of Harnashi society live, although wealth is a curious question in a land of competitive generosity - certainly among the most respected citizens live here.