| Oi-Kas-Kibek - Chuvashia (Cuvasija) |
Oimur - Buryatia |
Oirat-Tura - Altay |
| Oi-Kas-Yandoba - Chuvashia (Cuvasija) |
Oimyakan - Yakutia (Sakha) |
Oirekoy Ostroshek - Perm Oblast’ |
| Oikas-Aslamas - Chuvashia (Cuvasija) |
Oina - Primorsky Krai (Primorskiy [Primorye]) |
Oirot-Tura - Altay |
| Oilava - Khanty-Mansi |
Oinanlahti - Karelia |
Oiwake - Sakhalin Oblast’ |
| Oimekön - Yakutia (Sakha) |
Oinolovo - Leningrad Oblast’ (Leningradskaya Oblast’) |
Oiyavois - Karelia |