Introduction to the 65-degree bend of the Yellow River: The cause of Fenglingdu: After the Yellow River passes through Hekou Town, it is blocked by the north-south Luliang Mountains, turns south, and flows through the canyon on the border of Shaanxi and Shanxi provinces. between. After the river cascades from Hukou Falls, it continues to flow southward out of Longmen and near Tongguan. It is blocked by Huashan, one of the branches of the Qinling Mountains that runs east-west, and turns eastward.