Capel Celyn a Drowned village inside Tryweryn a Drowned Valley , Llyn Celyn 2022 and the History 

That’s a great video - thanks for sharing. The gravel mounds you mentioned are in fact spoil heaps from when Tarmac company were constructing the dam in the early 1960s. They discovered that most of the raw material they needed for the dam was in the valley itself, so they literally quarried it from where we now see the mounds of gravel. The intention was to actually landscape the area before it was totally submerged, but the lake filled in much quicker than they anticipated. They had thought it might take between 3 and 4 years to fill - but it filled to the brim in 8 months due to the exceptionally heavy rainfall in the winter of 1964-65.

Very interesting,thanks

Really interesting 👍👍👍👍

First drove round this lake in 1969 , not many roadside trees then.

Mae be sydd wedi digwydd yma yn gwilldio fi.