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Penallta Marsh is a small, marshy grassland dotted with anthills amongst the Purple Moor Grass. Heath Spotted and Southern Marsh Orchid and Devils Bit Scabious provide colour in the summer. Alder and Willow trees flourish in the swampy conditions with Bulrush, Hemlock, Water Dropwort, Hemp Agrimony and Hairy Willowherb all providing an excellent habitat for warblers.
Grid Reference: ST 136948.
Situated in Parc Penallta, on R47 of the National Cycle Route, near Ystrad Mynach.
By bus: Service 7 - Blackwood to Pontypridd stops on Nelson Rd. (see ‘by car’).
By car: From the A472 Nelson Rd. turn into Station Road (opposite the entrance to Ystrad Mynach station). Take 1st left into Griffiths St and park at end of street in the small community play area. Follow the access lane to the rear of the houses; the path into Parc Penallta is on the left behind the tall conifer hedge.
By bike: Just off R47 (Celtic Trail) on the eastern side of the park.