The Nasun River is the greatest river of the Tieros Empire. It flows south through Lenthinar from the huge freshwater lakes bordering the Hordelands, through the marshes, out to the sea. The industrial city of Hama lies on the Nasun. It uses the power of the river to drive its industry via waterwheels. The noria at Hama irrigate many towns further from the river along the road. The fertile band along the Nasun, fed by its annual floods, is the main source of Lenthinar's food. A nasunometer is located on the isle of Kifi, not far north of Hama.