《水经注·卷二》
北河又往东流经姑墨国南边。有姑墨川水注入。姑墨川水从姑墨西北流来，流过赤沙山，往东南流经姑墨国西边，国都是南城。
北河又东径姑墨国南，姑墨川水注之，水导姑墨西北，历赤沙山，东南流径姑墨国西。
The North River continues to flow east, and passes by the southern border of the Gumo Kingdom. The Gumo River flows into it. The Gumo River originates from the northwest of Gumo, and flows through the Chisha Mountains and the western border of the Gumo Kingdom. The national capital is the southern city.