Here we have another example of a placename supposedly linked to Lleu (see also Dinas Dinlleu in the bookmark for page 55). Today, we speak of the Nantlle valley (Dyffryn Nantlle), which is situated to the east of Penygroes and Talysarn in Gwynedd. One of the villages in Dyffryn Nantlle is called Nantlle. It is the location of a lake known as Llyn Nantlle Uchaf (‘Upper Nantlle lake'), there having once also been a Llyn Nantlle isaf (‘Lower Nantlle lake'). During the 19th and early 20th centuries, slate was mined in the Nantlle valley, and the scars left by the industry are still to be seen on the landscape.