River with O
- Ohio river
- Oder
- Ottawa
- Oklahoma
- Oklahoma river
- Odra
- orinoco
- Orlando river
- Olga
- Obey river
- Otay
- obed river
- olive
- Otter Creek
- ottawa river
- Otay River
- Olympus
- Oak Orchard River
- Osage
- orion
- Orljava
- Omaha river
- Orinoko
- Ottowa
- Otto
- Oka
- Onyx
- Ovens
- Owl
- Ocoee
- Oswego
- Obed
- olympia
- Okavango
- Ogden
- ophelia
- Oneida
- ozark
- Oker
- One
- Olt
- oregan river
- oman river
- ona
- Ottowa River
- Olly
- Ouse river
- oolong
- old
- orange county river
- oxe
- Ostsee
- osiris
- owen
- OREGON
- Obion River
- Okechobee
- Okanogan
- orwell
- oval river
- olivia
- omar
- omaha
- only
- Onions
- Oil
- olentangy
- Ober
- Oise
- olan
- over
- Opera
- Oyster
Riječi na popisu River with O dolaze od igrača igre riječi Grad, Država, Selo.