Reservoirs & lochs · South Wales
Llwyn-on Reservoir
In or near Ystradfellte.
Llwyn-on Reservoir — reservoir in Wales, UK.

Wikimedia Commons contributors — see linked file page for photographer and licence licence
Plan your visit
- Typical visit
- 1 h–2.5 h
- Nearest railway station
- Pontsticill · 5.5 km
- Free entry
- Dog-friendly
Getting there & planning your visit
To visit Llwyn-on Reservoir, the nearest railway station is Pontsticill, located 5.5 km away. Entry to the reservoir is free, and it is accessible to visitors. The postcode for navigation is CF48 2HT.
About
Llwyn-on Reservoir is a reservoir in the United Kingdom. Managed by Dŵr Cymru Welsh Water. Wikidata describes it as: "reservoir in Wales, UK". Coordinates: 51.7972°, -3.4408°.
Photo gallery
From the Wikipedia article
Llwyn-onn Reservoir is the largest and southernmost of the three reservoirs in the Taf Fawr valley in South Wales. Cardiff Corporation Waterworks obtained an act of Parliament in 1884 to authorise construction of the reservoirs, to increase the water supply for Cardiff, but construction of Llwyn-onn Reservoir did not start until 1911 and was completed in the 1920s. The reservoir, which has been owned and managed by Welsh Water and its predecessor organisation, the Welsh Water Authority, since 1973, is located within the Brecon Beacons National Park with its eastern half in the Merthyr Tydfil unitary authority area and the western half in Rhondda Cynon Taf. The village of Llwyn-Onn is nearby and the A470 trunk road runs along its eastern shoreline.
Excerpt from Wikipedia under CC BY-SA 4.0. See the source article linked in Sources below.
Background
History
Cardiff Corporation had bought out the Cardiff Waterworks Company in 1879, and in March 1881 asked their Borough Engineer, John Avery Brandon Williams, to produce a report on all possible sources of water for Cardiff, so that they could plan for the future. Williams presented his reports in May and August 1881, suggesting that the best scheme was to impound the waters of the upper Taff Fawr. After consulting the water engineer John Frederick Bateman, who also recommended the Taff Fawr scheme in June 1882 as the one most likely to meet the needs for water at the lowest cost, the Corporation presented a bill to Parliament in November 1883, which was considered by a House of Commons Committee…
Sourced from Wikipedia under CC BY-SA 4.0.
- Coordinates
- 51.7972, -3.4408
- District
- Merthyr Tydfil
- Parish
- Vaynor
- Postcode
- CF48 2HT
- Parliamentary constituency
- Merthyr Tydfil and Aberdare
- Nearest railway station
- Pontsticill — 5.5 km
Sources
- wikidata: Q6662908 (CC0)
- wikipedia: Llwyn-onn Reservoir (CC BY-SA 4.0)
- commons: Llwyn-on reservoir.jpg (CC BY-SA 4.0)
Other places nearby

Bridge over Nant Aber-nant stream
Historic bridges · 0.3 km

Grawen Caravan & Camping Park
Caravan parks · 1.1 km

Garn Ddu
Mountains & hills · 1.9 km

Garn Ddu
Mountains & hills · 2.0 km

Cefn Cil-Sanws
Mountains & hills · 2.4 km

Cefn Cil-Sanws
Mountains & hills · 2.4 km

Cefn Cil Sanws
Mountains & hills · 2.5 km

Penmoelallt
Mountains & hills · 2.5 km

Cadair Fawr
Mountains & hills · 3.0 km

Nant Ddu Lodge Hotel
Hotels · 3.1 km

Ogof Fawr
Caves · 3.2 km

Coed Owen Bunkhouse
Hostels · 3.3 km
Nearby
Historic bridges · South Wales
Bridge over Nant Aber-nant stream
Bridge over Nant Aber-nant stream — Grade II listed building-listed bridge in wales-south, United Kingdom.
Caravan parks · South Wales
Grawen Caravan & Camping Park
Grawen Caravan & Camping Park — a caravan park in wales south.
Mountains & hills · South Wales
Cefn Cil-Sanws
Cefn Cil-Sanws — mountain in wales south. Elevation: 461 m.
Where to eat & stay near Llwyn-on Reservoir
Places to stay
Caravan parks · South Wales
Grawen Caravan & Camping Park
Grawen Caravan & Camping Park — a caravan park in wales south.
Hotels · South Wales
Nant Ddu Lodge Hotel
Nant Ddu Lodge Hotel — a hotel in wales south.
Places to eat & drink
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Sultan of Wales
Sultan of Wales — a restaurant in wales south.
📷 5Historic pubs · South Wales
White Hart
White Hart — Historic pub — listed building or notable heritage status.
Historic pubs · South Wales
Penllwyn, Former Manor House Now Penllwyn Arms Public House
Penllwyn, Former Manor House Now Penllwyn Arms Public House in Wales South, United Kingdom.
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Frequently asked questions
- Where is Llwyn-on Reservoir?
- Llwyn-on Reservoir is in South Wales, United Kingdom (postcode CF48 2HT), in the parish of Vaynor.
- What is Llwyn-on Reservoir?
- Llwyn-on Reservoir — reservoir in Wales, UK.
- How do I get to Llwyn-on Reservoir?
- The nearest railway station is Pontsticill, about 5.5 km away. Drivers can use postcode CF48 2HT.
- Who runs Llwyn-on Reservoir?
- Llwyn-on Reservoir is operated by Dŵr Cymru Welsh Water.
- Is Llwyn-on Reservoir free to visit?
- Yes, Llwyn-on Reservoir is free to enter.
- How do I get to Llwyn-on Reservoir?
- The nearest railway station is Pontsticill, about 5.5 km away. Drivers can navigate to postcode CF48 2HT.