摘要
The cover photo was taken near Longyangxia Reservoir,which is on the upper reaches of Yellow River.The landforms in the region are mainly mountains,hills and valley basins.It is1,684 kilometers from the source of the Yellow River and 3,376 kilometers from the mouth of the Yellow River.It is the first canyon where the Yellow River enters the river canyon area after passing through the Qinghai Prairie.
