[一]　集解徐广曰：「方城县有督亢亭．」駰案：刘向别录曰「督亢，膏腴之地」．　索隐地理志广阳国有蓟县．司马彪郡国志曰「方城有督亢亭」．　正义督亢坡在幽州范阳县东南十里．今固安县南有督亢陌，幽州南界．