| Hint | Answer | % Correct |
|---|---|---|
| Capital of Norway | Oslo | 99%
|
| Turkish empire which ruled much of West Asia, North Africa, and southeast Europe | Ottoman Empire | 96%
|
| Mountain that was home of the gods in Greek mythology | Mount Olympus | 91%
|
| German name for Austria | Österreich | 81%
|
| Archipelago to the north of mainland Scotland | Orkney | 68%
|
| Term for administrative divisions in Belarus, Bulgaria, Russia, and Ukraine | oblast | 62%
|
| Major city in southwest Ukraine, located on the Black Sea | Odesa | 54%
|
| River that flows through Czechia, Poland, and Germany, forming part of the border between Poland and Germany | Oder | 47%
|
| Strait that separates Denmark and Sweden | Øresund | 39%
|
| Language spoken in southern France, also known as Provençal (though this can also refer to a specific dialect of the language) | Occitan | 34%
|
| Third-largest city in Czechia and the largest in the Czech Silesia region | Ostrava | 34%
|
| Largest city in northern Finland | Oulu | 33%
|
| Germanic kingdom which ruled over Italy in the fifth and sixth centuries, before being defeated by the Byzantine Empire | Ostrogothic Kingdom | 26%
|
| City in northwest Germany that was the capital of a Grand Duchy of the same name | Oldenburg | 24%
|
| Second-largest island of Sweden | Öland | 19%
|
| Smallest voivodeship of Poland by area and population, and its capital city | Opole | 8%
|
| Canton in central Switzerland considered to be one of six half-cantons | Obwalden | 7%
|
| River in Russia that is the largest tributary of the Volga | Oka | 7%
|
| Germanic soldier and king who overthrew the last Western Roman emperor | Odoacer | 6%
|
| Province in the east of the Netherlands | Overijssel | 5%
|