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