What do you mean, back into the river?

1, the landform of China is high in the west and low in the east. The characteristic of water is that it flows to the lower part, so most rivers in China flow from the higher part (west) to the lower part (east).

The geographical features of some areas are indeed high and mountainous in the east. The terrain in the west is low, so in some areas, this special water flows back to the west.