Ocean Island (Banaba) Kiribati
Ocean Island (Kure Island) United States
Ogaden Ethiopia; Somalia
Oil Islands (Chagos Archipelago) British Indian Ocean Territory
Okhotsk, Sea of Pacific Ocean
Okinawa Japan
Oman, Gulf of Indian Ocean
Ombai Strait Pacific Ocean
Oran [US Consulate] Algeria
Oranjestad Aruba