Swans rest in wetlands of the Yellow River in Bayannuur, Inner Mongolia autonomous region. [Photos by Qi Hongyan/for chinadaily.com.cn]

As the setting sun's rays reflected on the waters of the wetlands in Bayannuur, Inner Mongolia autonomous region, on Wednesday, more than 100 swans were observed at rest. 

Swans rest in wetlands of the Yellow River in Bayannuur, Inner Mongolia autonomous region. [Photos by Qi Hongyan/for chinadaily.com.cn]

Swans rest in wetlands of the Yellow River in Bayannuur, Inner Mongolia autonomous region. [Photos by Qi Hongyan/for chinadaily.com.cn]

Migratory birds stop over for about a month in the wetlands, located in the Yellow River basin, before they leave in November to spend the winter in southern China, mostly in Sanmenxia, Henan province.

Thanks to the improvement of the lake's water quality, increasing numbers of birds are coming regularly.

Swans rest in wetlands of the Yellow River in Bayannuur, Inner Mongolia autonomous region. [Photos by Qi Hongyan/for chinadaily.com.cn]