The Tigris is one of the important rivers in Asia.

We often have picnics by the river on weekends.

We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

The Adige is the second longest river in Italy.

The Congo River is the largest river in Africa.

The Danube is one of the longest rivers in Europe.

The Aar river is one of the beautiful rivers in Switzerland.

The Don is one of the important rivers in Russia.

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