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Merthyr Valley Group

We are the Merthyr Valley Ramblers. We open the way for everyone in our local community to enjoy the pleasures of walking.

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Join the Ramblers and enjoy

  • unlimited free access to 50,000 Ramblers group walks
  • a library jam-packed with thousands of tried-and-tested routes
  • a welcome pack teeming with top tips plus our Walk magazine
  • exclusive discounts from our partners
  • knowing your support is opening up more places to walk and helping more people discover the joy of walking
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Overview

We start the walk at the layby on the A470 (just before the turning to Garwnant centre). We follow the nature trail along the reservoir. Then turn onto the road bridge and pass Garwnant centre. We then take a meandering path beside the river into the forest. We stop for lunch at the top of the hill and continue on the forest paths onto  farmland with views. We pass an old farm and follow a narrow lane, before crossing the weir and following the nature trail back to the layby.

Saturday, 28 February 2026
Start time:
10:00 am
Estimated finish time:
3:00 pm
Difficulty:
Moderate
Distance:
11.3km / 7.0mi
Ascent:
N/A
Type:
circular

Dog friendly. Only one stile. Mostly forestry paths. Some mud especially after we cross the weir. Lovely views of the reservoir and mountains.

Features

  • Toilets available
  • Car parking available
  • Dog friendly

Starting point

Grid reference:
SO 00863 12411
Nearest postcode:
CF48 2HT
what3words:
crouch.topping.replying
Start time:
10:00 am

Layby on A470 next to Llyn-onn Reservoir

Join the Ramblers and enjoy

  • unlimited free access to 50,000 Ramblers group walks
  • a library jam-packed with thousands of tried-and-tested routes
  • a welcome pack teeming with top tips plus our Walk magazine
  • exclusive discounts from our partners
  • knowing your support is opening up more places to walk and helping more people discover the joy of walking