Esrolia is a densely populated nation which occupies the northwestern portion of the Holy Country between Mirrorsea Bay and the Old Woods, where Aldryami still dwell. It consists of several rich valleys, and the rolling lands between them, broken only by two significant rises: the Delainan Hills and Harasarl Hills. It is a teeming land of rivers subdivided by numerous irrigation ditches. The land is verdant with some large forests and many small woods of semi-tropical trees and brush. Agriculture is easy in these well-watered, fertile lands. The Lyksos River carries the outflow of the Creek-Stream River, while the Malthin River and Gorphin River drain the Arstola Forest and the Skyreach Mountains.
Although Esrolia is primarily rural and agricultural, it has a large urban population. Nearly 200,000 people live in Esrolian cities, almost 10% of the total population. Cities are ruled by queens, who are selected from among the resident clans. The queen is not an absolute ruler, but presides over the city council in a manner analogous to a tribal king.