The Yihe River is one of the tributaries of the Luo River on the south bank of the Yellow River, and the Luoshui River merge into the Yiluo River. The Yihe River and Luohe River support the Yiluo culture, known as the "Oriental Two River Civilizations". The Longmen Grottoes of the World Cultural Heritage are distributed on both sides of the Yihe River.