This is a tough, but rewarding circular route in Eryri National Park (Snowdonia) that visits Dinorwic Quarry, Elidir Fach, and Elidir Fawr. The trail starts at the car park near the Welsh Slate Museum, opposite Vivian Quarry, which would make a great visit to learn more about the area. After following a short section of road to the banks of Llyn Peris, begin the …