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Merthyr Tydfil (waliisk: Merthyr Tudful) as en county borough an en principal area uun Süüdwales. Diar wene gud 58.000 minsken üüb en flaak faan 111 km². Hoodstääd as Merthyr Tydfil. Merthyr Tydfil hiart tu't preserved county faan Mid Glamorgan.
Trinjam lei Powys, Rhondda Cynon Taf an at Caerphilly County Borough.