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.
The population of Blaenllechau is fewer than 1000. The village is delineated by the river border, which separates Blaenllechau from its neighboring Ferndale, with the well-known Blaenllechau waterfall being a tributary.