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Tal-y-Llyn or Llyn Mwyngil is a very picturesque, mesotrophic lake lying just below Cadair Idris, which was formed when a huge landslip dammed the valley. It's approximately 220 acres in area, 1 mile long, about 10 feet deep and discharges into the river Dysynni. Parking can be found at laybys along the B4405 which runs along the south side, whilst a lane and footpath runs along the north side. Facilities at the southern end include a hotel / pub and an ice-cream shop. The high mountains on either side provide good shelter from wind.
