| Answer | Crossword Clue |
|---|---|
| BASINS | Areas drained by rivers. |
| BASINS | Tracts of land drained by rivers. |
| DELTAS | Areas at rivers' ends |
| hinterlands | The often uncharted areas beyond a coastal district or a river's banks |
| hinterland | The often uncharted areas beyond a coastal district or a river's banks |
