| Clue | Source | Date |
|---|---|---|
| River that formed the ancient boundary between Brecknockshire and Carmarthenshire (5) | Mirror Quiz | 29 Jun 2026 |
| River that formed the ancient boundary between Brecknockshire and Carmarthenshire (5) | Mirror Quiz | 19 Feb 2026 |
| River that formed the ancient boundary between Brecknockshire and Carmarthenshire (5) | Mirror Quiz | 19 Jun 2025 |