A little way from Cerrigydrudion are the Alwen and Llyn Brenig reservoirs -- the former created about half a century before the latter -- which supply water to Merseyside and further afield in north-west England. Some forty miles to the south are the Elan Valley reservoirs, created a little earlier (very early 20th century) than the Alwen, supplying water to Birmingham: nearest significant settlement to Elan Valley reservoirs is Llansantfraed Cwmdeuddwr, Powys.