That would be the Oise River.
Ouse
Ohio River.
The French river that starts with the letter Y is the Yonne.
Ob is a river in Russia. It begins with the letter O.
Ohio River
Ohio River
organisee
One example of a word in French that starts with the letter "o" is "oiseau," which means "bird" in English.
The Garonne River starts in the Pyrenees and feeds into the Atlantic Ocean.
The Occoquan River is in Virginia. Its length is 39.8 kilometers.
oder oder
Omaha, Nebraska