| Answer | Crossword Clue |
|---|---|
| SEGURA | Mountain range and river in southeast Spain. |
| CANTABRIAN | Mountain range in N. Spain. |
| vicariance | The geographical separation of a population, typically by a physical barrier such as a mountain range or river, resulting in a pair of closely related species |
| orogenies | A process in which a section of the earth's crust is folded and deformed by lateral compression to form a mountain range |
| MINHO | River in Spain and Portugal. |
| DOURO | River in Spain and Portugal |
