《水经注·卷二十一》
冯异据有此城，投降世祖，以报答他在巾车乡开释之恩。 龙山水又往东北流，汇合了两条水，这两条水都发源于龙山，北流注入龙山水。龙山水又往东北流，注入汝水。
冯异据之，以降世祖，用报巾车之恩也。其水又东北流，与二水合，俱出龙山，北流注之，又东北入于汝水。
Feng Yi took this city and surrendered to the founding emperor to repay the favor of his release in Jinche Township. The Longshan River flows further to the northeast, merging with two other rivers, both of which originate from Longshan Mountain, and flow northward into the Longshan River. The Longshan River flows further to the northeast and merges into the Ru River.