《水经注·卷十九》
渭水又往东北流，与部水汇合。部水上流在昆明池北承接部池，就是周武王建都的地方。
渭水又东北与鄗水合，水上承鄗池于昆明池北。周武王之所都也。
The Wei River further flowed northeast and converged with the Bu River. The upper reaches of the Bu River were in the north of Kunming Pool, where the Bu Pool was located, the place where King Wu of Zhou built his capital.