Looking for the best mountain biking routes around Llyn y Fan Fach? Then browse our collection of mtb rides around this beautiful lake in Carmarthenshire below — and discover more of on your next visit.

Usk Reservoir and Glasfynydd Forest loop	Easy 00:59 11.9km
Banwen Gwys & Swansea Valley loop from Dan-yr-Ogof — Bannau Brycheiniog (Brecon Beacons) National Park	Intermediate 02:37 26.5km
Usk Reservoir Track – Usk Reservoir loop from Trecastle	Easy 00:43 8.85km
Reindeer Farm – Bridleway Over Black Mountain loop from Pen y Cae	Expert 03:23 37.5km
View from the Dam Wall loop from Trecastle	Intermediate 01:25 17.1km

Plan. Save. Navigate. Your best adventures await.

Start today with a free komoot account.

Map data © OpenStreetMap contributors
1
1
Usk Reservoir and Glasfynydd Forest loop
00:59
11.9km
12.2km/h
160m
150m
Easy
4.3
(3)
19
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
Map data © OpenStreetMap contributors
2
2
Banwen Gwys & Swansea Valley loop from Dan-yr-Ogof — Bannau Brycheiniog (Brecon Beacons) National Park
02:37
26.5km
10.1km/h
730m
730m
Intermediate
3.0
(1)
1
Intermediate mountain bike ride. Good fitness required. Advanced riding skills necessary.

Let us show you the way with the komoot mobile app
With a free komoot account, you can easily find, customize, and navigate endless outdoor adventures around Llyn y Fan Fach and beyond.
Map data © OpenStreetMap contributors
3
3
Usk Reservoir Track – Usk Reservoir loop from Trecastle
00:43
8.85km
12.3km/h
110m
120m
Easy
4.7
(7)
30
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
Map data © OpenStreetMap contributors
4
4
Reindeer Farm – Bridleway Over Black Mountain loop from Pen y Cae
03:23
37.5km
11.1km/h
940m
940m
Expert
1.0
(1)
5
Expert mountain bike ride. Very good fitness required. Suitable for all skill levels.
Map data © OpenStreetMap contributors
5
5
View from the Dam Wall loop from Trecastle
01:25
17.1km
12.0km/h
300m
300m
Intermediate
6
Intermediate mountain bike ride. Good fitness required. Advanced riding skills necessary.