The Glaslyn is a river system in Snowdonia, Gwynedd, with distinct upper and lower sections offering different paddling experiences. The upper river, particularly near Pont Aberglaslyn, features fast-flowing rapids and a gorge, suitable for experienced whitewater kayakers. This section requires high skill due to powerful currents, submerged boulders, and the potential for entrapment, as conditions can become dangerous, especially after rain when water levels swell. A tragic fatality has occurred here, underscoring the hazard. The river flows into Llyn Gwynant, a 113-acre natural lake on the Afon Glaslyn popular with outdoor centres. Access to Llyn Gwynant is via a private campsite at its north end, requiring a permit and a fee of £5 per boat per day, plus a day visitor charge; launching is allowed from 9am to 10pm. The river continues from the lake and is also paddled from Nantmor, where the rapids through the gorge end at Pont Afon Glaslyn, providing a fairly clear stretch. The overall character ranges from intense, technical whitewater in the upper reaches to more placid lake paddling on Llyn Gwynant, set within the dramatic mountain scenery of Snowdonia National Park. The area is a habitat for diverse wildlife, including the Glaslyn Ospreys near Pont Croesor. For lake paddling specifically, Llyn Padarn is an alternative with sheltered bays that are good for instruction when other locations are too windy, though group organisers may require a permit. Facilities for paddlers are limited and often fee-based, with specific launch points like slipways and honesty box payments at some locations.