When I looked up at the sky, a beautiful blue sky was spread out.

The sky is blue, and the weather is nice, isn't it?

The Ganges is one of the most important rivers in India.

I have visited the Yellow River.

It is said that this watercourse was deep enough for large ships to pass through in the past.

The Wei River is one of the important rivers in China.

A river dolphin is a rare type of dolphin that lives in freshwater.

I went fishing for brook trout.

Hebo is a god in Chinese mythology, considered to be the god of rivers.

The Kappa, also known as Kawaberi, is a mythical creature in Japanese folklore.