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