Beddgelert Forest: Derwen Circuit and Llyn Llywelyn

A longer woodland circuit from the public Beddgelert Forest car park, following the complete Derwen route through the northern forest before returning beside Llyn Llywelyn. The loop reaches the quieter tracks towards Cwm Du, descends to the lake and follows its western and southern sides. Forest views towards the surrounding Eryri mountains and the lake make good places for a pause.

This is a walking version of the yellow marked Derwen cycle route. Natural Resources Wales permits walkers on these forest roads and bridleways. Follow the mapped route at the numbered forest junctions and expect to meet cyclists, riders and occasional working vehicles. Give them room, keep dogs under control and follow any forestry closure or diversion signs. The route does not climb a mountain summit.

Allow around four hours for the approximately 11 km circuit, including the climbs and a short lake stop. The operator describes sustained climbs on forest roads; gravel, rough surfaces and wet or muddy patches require footwear with grip. It is a moderate half-day walk rather than a level lakeside stroll. Bring water, food and a waterproof.

There are two gated crossings of the Welsh Highland Railway, one on the outward route and one on the return. Look and listen for trains, obey the crossing instructions and close the manual gates behind you. Use the mapped crossings only.

Start at the free Natural Resources Wales forest car park, reached by the signed track off the A4085 north of the Forest Holidays entrance. Use the public forest parking, not the holiday site. Overnight parking is not permitted, and the operator lists no toilets here.

Route and access information: Natural Resources Wales, Beddgelert Forest visitor page and its linked Derwen route map, checked 4 October 2026. The walking time above is an estimate for this full circuit; the operator's shorter time is for cycling.