GPS Cycle and Walking Routes

Cefni Reservoir

4 miles (6 km)

Enjoy a nice circular walk around this pretty reservoir on Anglesey. Also known as Llyn Cefni the lake is located just to the west of the town of Llangefni. The lake and its surrounding woodland make for an easy afternoon stroll. On a clear day the mountains of Snowdonia make an excellent backdrop to the walk.
You can start the walk from the reservoir car park, positioned at the northern end of the water. You'll find it just west of Rhosmeirch with a postcode of LL77 7RQ for your sat navs. From here you can pick up the footpaths heading through the woodland surrounding the lake. It's about 3.5 mile walk so will probably take about 1.5 hours at a steady pace. On the way look out for the tracks of theAnglesey Central Railway, although no longer used, they still run over anembankmentwhich crosses the water. The area is also a designated nature reserve with bird hides where you can observe the wildlife which visits the area.


LL77 7RQ - Please note: Postcode may be approximate for some rural locations

Cefni Reservoir OS Map - Mobile GPS OS Map with Location tracking

Cefni Reservoir Open Street Map - Mobile GPS Map with Location tracking


Head into Llangefni after your walk and you'll find a number of good cafes and pubs.

Further Information and Other Local Ideas

Llyn Cefni is the second largest body of water on the island afterLlyn Alaw, which is also a reservoir. There's more nice trails and wildlife to see at the 770 acre lake.
In Llangefni we recommend a visit to the Dingle Nature Reserve. There's a nice tree lined boardwalk to stroll along here with various wildlife to see. Red squirrels, herons, buzzards and ducks can be seen on this interesting little trail. You can find it to the west of the town centre on the Afon Cefni at a postcode of LL77 7QE.

Cycle Routes and Walking Routes Nearby


Cefni Reservoir - - 152504

The Northern Edge of the Cefni Reservoir, as seen from the Bird hide on the banks of the reservoir

Cefni Reservoir, Anglesey - - 62695

Old rail tracks at the reservoir. When the branch line to Amlwch was opened in 1864 there was no reservoir in the centre of the island. It was built some 100 years later and, as it wasn't practicable to divert the line, a causeway was constructed across the reservoir. The line is not officially closed but hasn't been used for twelve years. This is the view from the causeway looking north.

Cefni Reservoir - - 1593608

View from caravan site across Cefni Reservoir, the mountains of Snowdonia in the background.

Track alongside the Cefni Reservoir - - 155782

View of the track running alongside the Reservoir

The Cefni Reservoir Dam - - 962495

The Cefni Reservoir Dam. The man made lake was created immediately after WWII. It has a capacity of 400 million gallons.

Forest at the Cefni Reservoir Park - - 1398950

Forest at reservoir. The dot above the trees is a Griffin of SARTU (Search and Rescue Training Unit) RAF Valley.

GPS Files

GPX File

Cefni Reservoir.gpx (On Desktop:Right Click>'Save As. On Ipad/Iphone:Click and hold>Share>Save to Files')

Memory Map Route

Cefni Reservoir.mmo (On Desktop:Right Click>'Save As. On Ipad/Iphone:Click and hold >Share>Save to Files)