He goes to the gym every day to train his triceps surae muscle.

He damaged his peroneus tertius muscle due to a foot injury.

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.

A water strider was floating on the pond in the park.

Kawasima is my best friend.

Mr. Kayukawa is my best friend.