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.

He likes to take a walk in the park at dusk.

Linear programming is a part of operations research and is used to find the optimal solution.

Paying the urban planning tax is a citizen's duty.

The United Nations Environment Programme is providing solutions to global environmental problems.

The Shatt al-Arab is located between Iraq and Iran.

Yesterday, I checked the location of the Edogawa on an old map.