Llyn Cwellyn – Accessibility

Geography

Llyn Cwellyn lies within a broad glacial valley in Eryri (Snowdonia), and its surrounding geography gives it a much more open and dramatic character than some of the smaller lakes nearby. The lake itself is long and narrow, aligned roughly northeast to southwest, and sits at about 150 metres above sea level. It was formed by glacial action during the last Ice Age, when moving ice carved out a deep U-shaped valley and left behind a basin that later filled with water.

The lake now drains eastwards via the Afon Gwyrfai, which eventually flows to the sea at Caernarfon. A small dam at the eastern end regulates water levels, but the lake remains largely natural in character. To the south-east of the lake rises the massif of Yr Wyddfa (Snowdon), whose north-western slopes descend toward the water. One of the most striking features above the lake is Clogwyn Du’r Arddu, a steep, dark cliff face formed of hard volcanic rock. These southern slopes are rugged, rocky and steep, with crags and scree that create a dramatic backdrop. This side of the lake feels imposing and mountainous.

Parking & Water Access:

Parking here has a few options, which depend on the season, and whether facilities are open or not.

Option 1: Snowdon Base Camp, is a great place to launch. The car park is gravel, but it’s manageable with a wheelchair. They have a long wooden walk way that leads to the lake, and a small beach that will be easy enough to launch from with support. There’s no disability specific equipment here, though, as far as we’re aware. Parking charges for here are unknown. This site is closed out of season, often for renovations.

Option 2: Small car park off the A4085, which is part tarmac, and part concrete. It’s very easy to move about on if you use a wheelchair, and you can easily use the boardwalk, through the woodland, to the water. As you get close to the water, however, there can often be mud, and debris from the trees, so you may need support. There are disabled spaces, though, and when we kayaked here, parking for disabled people was free (with a blue badge).

Option 3: Snowdon Ranger Path, car park, which is across the road (A4085), from option 2. This would make getting into the water more difficult, as water craft would need to be moved across the road, however it may be an option in busier times. We’re unsure of the cost at the moment.

Weather & Water

North Wales’ lakes are beautiful places for kayaking, canoeing, and paddle boarding. All are framed by mountains, quiet in the early morning and inviting on calm days. However, they are also inland waters that can turn quickly from tranquil to challenging when the wind picks up.

Even moderate wind over an open lake can generate chop and waves. On larger lakes with long fetch (the distance over which the wind blows uninterrupted), small breezes can grow into significant surface waves that make paddling harder, tiring and potentially unsafe, especially if you’re blown across the lake rather than along the shore.

What This Means for Your Trip:

• Always check the local weather forecast and wind warnings before setting out. A yellow wind warning from the Met Office over North Wales can mean strong and gusty conditions that affect inland waters as well as coastal areas.

• Be cautious when the breeze exceeds ~Force 3–4 (10–20 mph), as this range is where lakes tend to go from smooth to choppy and tiring. (check out our wind scale at the bottom of this page).

• Know your ability and gear. Inexperienced paddlers should stay in sheltered bays and close to shore where winds have less fetch. Advanced paddlers with experience in dynamic conditions may handle stronger wind, but should always have the skills to self-rescue, and the means to call for help if needed. Paddling with a group is also a good way to stay safe, along with making sure you have the right equipment for your adventure.

Wildlife

The lake is famous for supporting a population of Arctic char (a rare, cold-water fish) and wild brown trout. On the water, there’s the great-crested grebe (often sighted), mallard, coot, mergansers, and occasionally, whooper swans in winter. On the shore/nearby you can see cormorants, herons, reed buntings, sandpipers, stonechats, and wheatears. The nearby Coed y Brenin forest is known for fallow and roe deer. 

Pollution

The pollution level of Llyn Cwellyn can be checked on Dŵr Cymru’s Storm Overflow map.

Mythology

Llyn Cwellyn is said to be enchanted by fairies (Tylwyth-Teg in Welsh). One story tells of a Shepard who captured a fairy, who agreed to marry him only if he promised never to strike her with iron. He accidentally did one day with his stirrup, and she vanished, only ever appearing on their secret meeting place, a nearby floating island above Llyn y Dywarchen, so she could be with him.

Another tale tells of a man who was lured to the shore of the lake by enchanting fairy music, where he was then trapped in their realm for seven years, and made to dance. A rocky crag at the end of the lake is called Castell Cidwm (Cidwm’s Castle), and named after a giant who allegedly lived in a cave there.

 

Wind Speed Guide for Recreational Paddlers

Wind Strength	Typical Conditions on Lakes	Notes
< ~10 mph Beaufort Scale 0-2	Calm water, small ripples only	Generally safe and pleasant for most skill levels.
~10–15 mph Beaufort Scale 3	Larger wavelets and breaking crests	Novice paddlers may find conditions tiring; wind against your course increases effort.
~15–20 mph Beaufort Scale 4-5	Small to moderate waves	Conditions can become challenging or unsafe for less experienced paddlers.
20 mph+ Beaufort Scale 5+	Rough water, frequent white caps (White horses)	Not recommended for recreational kayaking or paddle boarding — risk of capsize or being blown off course.