Llyn Brianne Reservoir & Dam — Place photograph (1 of 3)

Llyn Brianne Reservoir & Dam — Place photograph (2 of 3)

Rhandirmwyn, Llandovery, Carmarthenshire, Wales

Llyn Brianne Reservoir & Dam

Reservoir

Place photograph

7.2

Wildland

1–2 hours, Half day

Time

Free

Cost

Peaceful

Feel

LakesideRemote countrysideHillsPhotographersWalkersWildlife loversCyclists

Why it's Wildland

7.2

High in the Cambrian Mountains, Llyn Brianne is an immense upland reservoir held back by a 91-metre dam. Its scale is striking, but the setting is the draw: broad water, open mountain views and unusually dark skies.

Llyn Brianne pairs a vast upland reservoir with a dramatic dam, far-reaching Cambrian Mountain scenery and a recognised dark-sky setting. It feels remote enough for a proper pause, while car parks and nearby walking options make the landscape approachable.

Peaceful · Dramatic · Wild · Remote

Find your way

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Rhandirmwyn, Llandovery, Carmarthenshire, Wales

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The experience

Take in the reservoir and dam from the car parks, then explore a suitable local walk or return after dark for stargazing when skies are clear. Swimming and boating are prohibited; do not assume water access is permitted.

Things to do

Take in the dam and reservoir

Pause at a car park to appreciate the scale of the reservoir and its 91-metre dam against the upland scenery.

30–60 minutes

Walk by the reservoir and through forestry

Visit Mid Wales describes walks from the car park around the lake and through NRW forestry. Confirm the route, conditions and access locally before setting out.

Look for birds

Birdwatching is listed among the activities around Llyn Brianne. Bring binoculars and observe from places where access is permitted.

Stargaze beneath the open sky

Llyn Brianne is a Dark Sky Discovery Site, recognised in 2019. Choose a clear night and check local conditions before travelling.

Make a day of it

Quick escape · 1–2 hours

Quick Escape: dam and reservoir views

01
Use a listed car park to take in the reservoir and dam from the accessible viewpoints.
02
If time allows, follow a short section of a local walk, checking the route and conditions before setting off.

Half day · Half day

Make a half day of it: water, woods and open skies

01
Spend time at the reservoir and dam viewpoints.
02
Choose a suitable walk from the car park or through the forestry on the far side; check route details and conditions locally.
03
If the forecast is clear and your visit runs into the evening, stay for stargazing at the Dark Sky Discovery Site.

Full Wildland day · Full day

A wider Upper Towy day

01
Begin with the reservoir and a walk in the surrounding uplands.
02
Continue to RSPB Gwenffrwd-Dinas Nature Reserve for its woodland paths and wildlife.
03
Finish with a stop in Rhandirmwyn; check opening times and food availability before travelling.

Verified history

Llyn Brianne was created in the early 1970s by damming the River Tywi and other waterways. The reservoir holds more than 64 million cubic metres of water behind a 91-metre dam. Visit Mid Wales describes it as Wales’s second-largest reservoir by volume and South Wales’s largest lake.

Hidden details

A recognised dark-sky site — Llyn Brianne was awarded Dark Sky Discovery Site status in October 2019, the first site in the Cambrian Mountains to receive the award, according to Visit Mid Wales.

When to go

All year · Daylight for reservoir views and walking; a clear evening for stargazing.

The reservoir and dam can be visited throughout the year. Stargazing depends on clear skies, while upland weather can change and feel chilly, so check conditions before setting out.

The upland setting can be chilly even on a warm day. Check the forecast and bring suitable clothing; clear skies are needed for stargazing.

Worth pairing with

RSPB Gwenffrwd-Dinas Nature Reserve

A nearby reserve with ancient oak woodland, wildlife and walking routes, identified by Visit Mid Wales as less than a mile from the reservoir listing.

Rhandirmwyn and the Upper Towy Valley

The local community visitor guide highlights the village, the River Towy and nearby walking and wildlife experiences for a broader day in the area.

What to look for

The scale of the 91-metre dam against the open upland setting, the wide views over the reservoir, and the dark, open skies that earned the site Dark Sky Discovery Site status.

The story

Industry

Best time to go

Year-round; clear, calm evenings are best for stargazing, while daylight visits suit the reservoir views and walks.

For stargazing, choose a clear evening and allow time for your eyes to adjust. For views and walking, daylight offers the clearest orientation; conditions can be chilly in this upland setting.

How long to spend

1–2 hours, Half day

Perfect for

Photographers · Walkers · Wildlife lovers · Cyclists

Before you go

Google Maps

Google rating

4.8 · 214 reviews

Practical information

Opening & access

A scenic destination with car parks by the reservoir and dam; visitor information describes walks from the car park and routes through forestry. Check current access and local restrictions before setting out. Swimming, boating and fishing in the reservoir are prohibited according to Visit Mid Wales.

Check before visiting

Parking

Visit Mid Wales lists free parking and describes two car parks at the southern corner and two on the eastern edge. Check conditions before travelling.

Check before visiting

Toilets

Visit Mid Wales lists toilets at the car park. Check availability before travelling.

Check before visiting

Food & drink

No on-site food information is available in the supplied sources. Bring food and drink or check nearby options before travelling.

Check before visiting

Dogs

Check current local rules before visiting with a dog.

Check before visiting

Accessibility

Car parks provide access to views of the reservoir and dam, but the supplied information does not establish step-free routes or accessibility across the wider area. Check before visiting.

Check before visiting

Cost

Free

Water

Reservoir