premise: Qingtongxia () literally, "Bronze Gorge" is a city in the province of Ningxia in the north of China. Administratively, Qingtongxia is a county-level city within the prefecture-level city of Wuzhong. It is located on the left (northwestern) bank of the Yellow River, opposite and a bit upstream of Wuzhong main urban area.
hypothesis: Qingtongxia is located northwest of the Yellow River.
reason: The text states that it is on the northwestern bank of the Yellow River.