Llyn Bochlwyd

Llyn Bochlwyd is a glacial mountain lake in Snowdonia (Eryri), north Wales, within Conwy County Borough. At roughly 555 m above sea level, it fills a hollow called Cwm Bochlwyd in the Glyderau range, just above Llyn Ogwen.

What will you see at Llyn Bochlwyd?

The basin was carved by ice during the last glacial period, which makes this a classic tarn. Its water is clear and low in nutrients. Rock walls rise around it, including Clogwyn y Tarn and Bochlwyd Buttress, and the slopes at the head of the cwm lead toward Glyder Fach and Tryfan. It is among the most accessible lakes in this part of the mountains, so expect company on fine days.

How do you get to Llyn Bochlwyd?

The usual start is the National Trust car park for the Carneddau and Glyderau, beside Ogwen. A wooden footbridge takes you over Afon Idwal. About 500 m on, the path begins to climb and bends between two huge rock buttresses. From there it is steep, stony and in places badly eroded.

• Short out-and-back version: about 3.2 km, around 1.5 hours.
• Difficulty: moderate, hiking boots recommended.
• Variation: start at Idwal Cottage, cross Cwm Idwal, climb steeply up the lower flank of Y Gribin, and come back beside the outflow stream.

Where can you go from here?

The lake works as a gateway into the Glyderau. From its shore you can continue to the Glyder Fach plateau, and experienced walkers link it with Tryfan (north and south ridges), Bristly Ridge and Y Gribin. Those loops involve scrambling and are not for beginners. A large share of the Glyderau is owned by the National Trust, so follow the local access guidance.

When should you go?

Pick a clear day, ideally between late spring and early autumn when the ascent is dry. Weather in Snowdonia turns quickly, so pack waterproofs and a warm layer even in summer. After rain the path is slippery and the section beside the crags needs care.

Frequently asked questions

Is Llyn Bochlwyd far from the car park?

No. The short route from the Ogwen car park is about 3.2 km return, roughly an hour and a half on foot.

Is the climb difficult?

Moderately. The start is easy, but after about 500 m the path turns steep and rocky, with eroded stretches.

How high is the lake?

About 555 m above sea level; sources give 555 to 556 m.

Can you reach Tryfan and Glyder Fach from the lake?

Yes, it is a common waypoint. Glyder Fach is a walking route, while full Tryfan traverses and Bristly Ridge are scrambles for experienced hikers.