From the highest point of the mountain road between Machynlleth and Dylife, a gated track leads to a small parking area at Glaslyn Lake. The oval-shaped oligotrophic lake lies within a nature reserve, and although swimming is allowed, it is discouraged. A path leads right around the lake, and can be boggy in places. There are two small 'beach' areas: one by the car park, and another at the north-west corner (above). The lake is drained by the Afon Dulas which descends through a deep gorge carved from the soft slate rock. Just to the north, a path leads up Foel Fadian, which has dramatic views towards the Cambrian mountains.
The track behind the lake runs along a watershed between two rivers; rain falling on the west side will flow into the Dyfi and enter the sea at Aberdyfi, whilst rain falling on the opposite side will flow into the Severn, passing through Newtown, Welshpool, Shrewsbury, Worcester and Gloucester before finally reaching the sea at the Bristol Channel.