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Mortimer Group

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

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

This is a spectacular walk on a fine day. We start off heading westerly, crossing the river Tawe and up over open moorland to Llyn y Fan Fawr. Taking the steep path behind the lake up onto Fan Brycheiniog, we then follow the ridge line mostly, apart from a contour around Picws Du. At Waun Lefrith we begin our descent, curling around Llyn y Fan Fach as we gradually drop to the level of the reservoir. From there we wind our way along the foothills back to the opposite side of Llyn y Fan Fawr for possibly a paddle if it’s very hot. From there it’s another yomp over open moorland back to the cars.

Most of the climbing is in the first half of the walk, with the climb up to Fan Brycheiniog being the toughest section. Each can take it at the pace they are comfortable with. Parts of the walk are on rough open moorland where there may be boggy areas depending on rainfall. There is one very short section of path where the path is narrow by a steepish drop. 

Saturday, 13 September 2025
Start time:
9:30 am
Estimated finish time:
3:30 pm
Difficulty:
Strenuous
Distance:
15.3km / 9.5mi
Ascent:
656.8m / 2155ft
Type:
circular

If you would like to join this walk, please book a place with the walk leader, if you are unable to attend, please cancel your booking so that someone else can take your place. If you turn up without booking we may have to turn you away.

Bring a mid-morning snack and a packed lunch.

Car sharing is encouraged to minimise car parking, fuel costs and carbon footprint.

Assistance dogs only.

 

Features

  • Car parking available

Starting point

Grid reference:
SN 85278 21765
Nearest postcode:
LD3 8YS
what3words:
downfield.resides.dunes
Start time:
9:30 am

Parking area on the old Trecastle Road approx 5 miles south of Trecastle. Explorer OL 13.

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