River with O
- Ohio river
- Oder
- Ottawa
- Oklahoma
- Oklahoma river
- Odra
- orinoco
- Orlando river
- Olga
- Obey river
- obed river
- Otay
- olive
- Otter Creek
- Olympus
- Otay River
- Oak Orchard River
- Osage
- ottawa river
- orion
- Ottowa
- Orinoko
- Orljava
- Omaha river
- Owl
- Onyx
- Otto
- Ovens
- Oka
- Obed
- Oswego
- Ocoee
- ozark
- oman river
- Olt
- oregan river
- One
- ophelia
- Oneida
- Oker
- Okavango
- olympia
- Ogden
- olivia
- only
- over
- Ober
- Oise
- Oil
- olentangy
- omar
- old
- omaha
- Onions
- Okechobee
- oval river
- orwell
- Ottowa River
- olan
- Olly
- oolong
- orange county river
- oxe
- Ouse river
- Obion River
- OREGON
- owen
- osiris
- Ostsee
- Okanogan
- ona
- Oyster
- Opera
Слова в списке River with O исходят от игроков словесной игры Игра категории.