The Tao River (洮河) is a river in the north-west, flowing through what is now Gansu before joining the Wei and then the Yellow River. It marked part of the frontier between Han/Wei territories and the Qiang and other peoples.
Du Ji, renowned for his good governance, died near the Tao River in 224 while serving on the north-western front. His death there is noted in the histories alongside his long record of loyal service.