Llyn Conwy - Conwy

Llyn Conwy is a lake and the source of the River Conwy which, on flowing south out of the lake, swings round to then generally flow in a northerly direction for a distance of some 27 miles (43 km) to its discharge in Conwy Bay. This is an area of Ordovician rocks, lending its name to the "Llyn Conwy Formation", which is identified by its yellowish rhyolitic tuffs. This Formation also reappears in Afon Tryweryn to the south-east, where the hard rock was utilized in the construction of Llyn Celyn dam Llyn Conwy is owned by the National Trust and, whilst a natural lake, is managed as a reservoir by Welsh Water