Follow the old railway through Clyne Valley Country Park from Blackpill to the former Dunvant station area, then return along the same path. The roughly 9.5 km route gives a longer woodland walk on an established surfaced corridor, with gentle railway gradients rather than the steep paths on the valley sides. Allow about 2 hours 45 minutes.
Start in the public pay-and-display car park at the junction of Derwen Fawr Road and Mumbles Road in Blackpill. From the southern parking aisle, use the short pedestrian link onto the shared railway path and turn right inland. Stay on the main Clyne Cycle Path as it curves north beside woodland and the Clyne River, crosses the railway-path bridges and bends west toward Upper Killay. Continue on the railway alignment beneath Gower Road, past Killay Marsh, and north toward Dunvant. Turn around at the former station area beside the Walters Row access, before continuing toward Gowerton, and retrace your steps to the car park.
The valley contains traces of its coal mining, brickmaking and railway past. Keep to the main surfaced trail: the hillside paths and mountain-bike trails are separate routes. This is a shared-use path used by cyclists, runners and, on parts of the route, horse riders. Leave room when passing and keep dogs close. Fallen leaves, puddles and ice can make the surface slippery; much of the inland route is unlit, so plan to finish in daylight.
Check the car-park signs for current charges and hours. Toilets and refreshments are nearby at Blackpill rather than guaranteed along the trail. Follow any local works signs or temporary restrictions. Route and access information: Swansea Council Clyne Valley Country Park, the council Swansea cycle map, Transport for Wales Clyne Valley route information and the Clyne Valley Community Project.