page_title: Afon Twrch
hierarchical_section_title: Afon Twrch
caption_attribution_description: English: River Twrch. This is a view of the river Twrch looking south downstream from the side of Pen yr Helyg. Protruding in from the left of the picture is the very southmost end of Tyle Garw.
context_page_description: The Afon Twrch is a river which rises in the Black Mountain in south Wales. It forms the boundary between the counties of Brecknockshire and Carmarthenshire and, downstream of Ystradowen, between Brecknockshire and Glamorgan.
context_section_description: The Afon Twrch is a river which rises in the Black Mountain in south Wales.  It forms the boundary between the counties of Brecknockshire (currently administered as part of the unitary authority of Powys) and Carmarthenshire and, downstream of Ystradowen, between Brecknockshire and Glamorgan (and unitary authorities of Powys and Neath Port Talbot).
caption: Afon Twrch looking south downstream from the side of Pen yr Helyg
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