During the last Ice Ages, glaciers gouged out and deepened the Tawe Valley. With the retreat of the last glacier from the Swansea Valley 10,000 years ago, the Upper Clydach River was left perched high above the main valley floor. A spectacular waterfall formed at this point. Over the passage of time, the river cut back along its course to form a narrow gorge known locally as Cwm-Du-Glen. The gorge approximately 1km long follows the Upper Clydach River from the heart of Pontardawe, upstream to Rhydyfro. Here, a picturesque waterfall marks the termination of the gorge.
A Cicular walk returning via the Glanrhyd Plantation takes approx. 2 hour
UPDATE 12/7/17 Part of this trail is currently closed due to a landslip. The lower section from Pontardawe Cross to the bridge at James St is open as is the Plantation.
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