The Orstrey River is a 400 mile long watercourse in the southern Three Rivers continent. It has its source in The Chain, just south of Kilvisti and flows southward until it reaches the Fairge at Fenstre. Along the way, it passes through the city-states of Ardnes and Argyre. Geographically, it divides the regions of Arimorn from Hauld. South of Argyre, the river becomes broad and is nearly half-a-mile wide when it reaches Fenstre.