Sinyong is the third-largest city in Qaelin. A walled city, it lies on the southern coast of Qaelin at the mouth of the Inaro River. The Inaro flowed through the city, lined by fortified walls and guard towers. Viewed from above, Sinyong is shaped as two walled semi-circled clasped around the river.

Historically, Sinyong has come into many conflicts with Asharo, the capital of Ilar and its nearest neighboring city. In the War of Day and Night, Sinyong was beseiged by the forces of Mageria, a kingdom of Timandra.