Cefni Forest – Llyn Cefni Reservoir and Dam loop from Isle of Anglesey

Mountain biking trails

Cefni Forest – Llyn Cefni Reservoir and Dam loop from Isle of Anglesey

Easy

riders

Cefni Forest – Llyn Cefni Reservoir and Dam loop from Isle of Anglesey

00:51

11.7km

70m

Mountain biking

Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 27, 2026

Tips

Cycling is not permitted along parts of this route

After 2.16 km for 163 m

After 2.51 km for 98 m

After 3.47 km for 136 m

Waypoints

Start point

Bus stop

Get Directions

3.27 km

Cefni Forest

Highlight • Forest

Cefni Forest on Anglesey surrounds Llyn Cefni reservoir near Llangefni. It offers peaceful woodland trails for walking and cycling, linking to the Lon Las Cefni route. The forest is a sanctuary for red squirrels and diverse birdlife, making it a perfect spot for quiet nature exploration and wildlife watching.

Tip by

4.87 km

Llyn Cefni Dam

Highlight • Monument

Llyn Cefni Dam

During World War II, a water scheme was devised for the town of Llangefni in central Anglesey. It involved water from a local source being pumped to two settling tanks in the Dingle part of the town. From here the water was pumped across the river to a reservoir and water tower, on the site of the present Pennant Estate. These arrangements became redundant with the building of the Cefni Reservoir, which was completed in 1951, but the settling tanks and pumping station survive in Llangefni to this day. The new scheme was designed to supply most of the water needs for the people of Anglesey for the foreseeable future

Tip by

5.64 km

Red Squirrel Viewing Spot

Highlight • Natural Monument

6.99 km

The Dingle Local Nature Reserve

Highlight • Gorge

The Dingle Local Nature Reserve is a 10 hectare (25 acre) wooded valley rich in wildlife and history. It is bisected by the river Cefni, which comes from the Welsh word "cafn" meaning trough or hollow.

The Dingle is a steep sided gorge formed by glacial meltwater during the last ice age hence one of its Welsh names Nant y Dilyw - Valley of the Deluge.

Another name for the Dingle is Nant y Pandy - Brook of the Fulling Mill. This refers to the old wool processing plant situated upstream.

Much of the reserve is ancient woodland which led to it being known as the Dingle as early as the 1830s. Dingle literally means steep wooded valley.

Tip by

7.15 km

St Cyngar's Church, Llangefni

Highlight • Historical Site

St Cyngar's Church is a church in the town of Llangefni in Anglesey, Wales. The building dates from 1824. It was designated a Grade II listed building on 8 July 1952.

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