All walks › Caerphilly and the Eastern Valleys
Caerphilly and the Eastern ValleysHenllys Bog and Woodland
Marshy grassland and woodland on the edge of Cwmbran, protected for a butterfly that has disappeared from most of Britain.
- Distance
- 3.1 mi / 5 km
- Time
- 1 hr 45
- Ascent
- 170 m
- Difficulty
- Moderate
- Shape
- Circular
Where it is
The circle shows the general area, not the exact start. Use the directions link below to get to the car park itself. Contours and paths shown are OpenTopoMap, drawn from OpenStreetMap data.
The route
Paths cross the reserve and loop through the woodland above. Wet underfoot in the grassland sections.
Worth knowing
- Marsh fritillary butterflies fly here in late May and June.
- The grassland is grazed to keep the sward suitable for their foodplant.
- Wet ground; boots even in summer.
What you’ll see
Marshy grassland and its flowers, marsh fritillaries in early summer, and woodland.
Background
The site escaped drainage and improvement, which is why the habitat and its butterflies survive.