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