Llyn Mymbyr

Llyn Mymbyr, looking towards the Snowdon Massif

Llynnau Mymbyr from the road

Llyn Mymbyr is a lake found amongst the mountains of Caernarfonshire, in the valley known as Dyffryn Mymbyr, running from the village of Capel Curig to the Pen-y-Gwryd Hotel. It is also known as or Llynnau Mymbyr ('Mymbyr Lakes') as the lake is divided almost into two lakes by a silt bar in its midst.

The lake is amongst the grandeur of Snowdonia. The A4086 runs along its northern bank, following the valley from Capel Curig up to Pen-y-Pass.

The greatest depth of Llyn Mymbyr is 30 feet. It is about ¾ mile long in total, both lakes taken together.

The lake is fed by the Nantygwryd (or Nant-y-gwryd), a river which has its source at Llyn Cwm-y-ffynnon and which is a tributary of the River Llugwy. The two rivers join at Capel Curig.

The lake was used for fly-fishing and sub-aqua courses in the 1960s and is still used today as a canoe training resource by Plas y Brenin and by schools.

Geographical and Geological Context

The lakes lie in a depression formed by a ring of sandstone called the Capel Curig Volcanic Formation which can be vaguely seen in the panorama below which was taken from the north side. The igneous rocks of Moel Siabod can be seen behind the lakes which are linear but in the panorama appear to bend at the delta between the two.

Llynnau Mymbyr from "The Ricks and Racks"

Outside links

• Location map: 53°5’54"N, 3°55’47"W
• Plas y Brenin
• 360 deg^ Panoramic View Of Llynau Mymbyr