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