Back Afon Twrch (suba sa Hiniusang Gingharian, lat 51,77, long -3,78) CEB Afon Twrch (Tawe) Welsh Afon Twrch (Tawe) OLO Afon Twrch Swedish
| Afon Twrch | |
|---|---|
 Afon Twrch looking south downstream from the side of Pen yr Helyg | |
 | |
| Etymology | afon / 'river' and twrch / 'boar'. |
| Location | |
| Country | Wales |
| Physical characteristics | |
| Source | |
| • location | Southern slopes of Bannau Sir Gaer (Carmarthen Fans) and Fan Brycheiniog |
| • coordinates | 51°52′49″N 3°42′39″W / 51.880359°N 3.710933°W |
| • elevation | 770 metres (2,530 ft) |
| Mouth | |
• location | River Tawe at Ystalyfera |
• coordinates | 51°45′40″N 3°46′55″W / 51.761194°N 3.782022°W |
• elevation | 70 metres (230 ft) |
| Length | 8.7 miles (14 km) |
| Basin features | |
| River system | River Tawe |
| Tributaries | |
| • left | Nant Gwys |
| • right | Nant Lluestau, Nant Manyn, Nant Y Ddraenen, Twrch Fechan, Nant Y Llyn, Nant Llynfell |
The Afon Twrch is a river which rises in the Black Mountain in south Wales. It forms the boundary between Powys and Carmarthenshire and, downstream of Ystradowen, between Powys and Neath Port Talbot.