The common kingfisher spread its beautiful blue wings and was flying.

Mr. Rakawa is my best friend.

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

We enjoyed a picnic on the sandbank in the river.

The Euphrates is one of the major rivers in the Middle East.

I enjoy fishing at the Edo River every weekend.

We participated in a downstream tour on the weekend.

Mr. Masukawa is my best friend.

The depressed cowry lives quietly at the bottom of the sea.

The Paleogene period was a very important time in the history of the Earth.