| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Обера | city | Misiones | Argentina | -27.49 | -55.12 | 1207 | 44842 |
| Олаварија | city | Buenos Aires | Argentina | -36.89 | -60.32 | 830 | 19394 |
| Олаваррия | city | Buenos Aires | Argentina | -36.89 | -60.32 | 830 | 19394 |
| Оливос | city | Buenos Aires | Argentina | -34.51 | -58.49 | 6 | 479351 |
| Олівос | city | Buenos Aires | Argentina | -34.51 | -58.49 | 6 | 479351 |