The Yellow River Basin has become a good habitat for human beings.At that time, the Fen River Valley was wide and flat, with green grass and continuous forests. Ostriches, wild horses, primitive cattle, elephants and deer were galloping on the riverbank meadows; schools of fish were roaming in the rapid rivers, including herrings and fish up to 1 year in length.The catfish, which are as large as a meter, are clearly visible on the lakeside and in the water.....