Blaenllechau is a small village located in the Rhondda Fach valley, Rhondda Cynon Taf, Wales. Neighbouring villages are Ferndale, Maerdy and Tylorstown. The population of Blaenllechau is less than 1000. The village is defined by the river border, flowing between Blaenllechau and neighbouring Ferndale, of which the well-known Blaenllechau waterfa…Blaenllechau is a small village located in the Rhondda Fach valley, Rhondda Cynon Taf, Wales. Neighbouring villages are Ferndale, Maerdy and Tylorstown. The population of Blaenllechau is less than 1000. The village is defined by the river border, flowing between Blaenllechau and neighbouring Ferndale, of which the well-known Blaenllechau waterfall is a tributary.