River with O
- Ohio river
- Oder
- Ottawa
- Oklahoma
- Oklahoma river
- Odra
- orinoco
- Orlando river
- Olga
- Obey river
- obed river
- Otay
- olive
- Otter Creek
- Osage
- Hirdetés
- ottawa river
- Oak Orchard River
- Olympus
- Otay River
- orion
- Omaha river
- Ottowa
- Orljava
- Oka
- Otto
- Ovens
- Onyx
- Owl
- Orinoko
- Ocoee
- Oswego
- Obed
- oregan river
- Oker
- Okavango
- Olt
- One
- oman river
- olympia
- Ogden
- Oneida
- ozark
- ophelia
- Olly
- olan
- osiris
- Ostsee
- owen
- omaha
- oolong
- ona
- Ouse river
- Obion River
- OREGON
- oxe
- orange county river
- Okechobee
- omar
- Onions
- Ober
- Oise
- olivia
- olentangy
- Oil
- oval river
- orwell
- over
- Okanogan
- Ottowa River
- only
- Opera
- Oyster
A River with O listán szereplő szavak a Ország Város szójáték játékosaitól származnak.