The reservoir was constructed in the early 1970s by damming the Afon Syfynwy.
The project flooded the valley of Llys-y-frân, necessitating the relocation of local farms.
The reservoir has a storage capacity of approximately 9.5 million cubic meters of water.
The site hosts a significant population of resident and migratory bird species, including grebes and occasional osprey sightings.
It is operated by Dŵr Cymru Welsh Water as both a utility asset and a recreational hub.
The trail network includes specific sections designed for technical mountain biking, distinct from the gravel-surfaced perimeter path.
Llys y Frân Country Park & Reservoir is a 350-acre site centered around a large drinking water reservoir in the Preseli Hills of Pembrokeshire. It features a 6.5-mile perimeter path that serves as a multi-use trail for walking, cycling, and trail running. The site includes a modern visitor center housing a café and changing facilities for water-based activities. The reservoir is a managed fishery stocked with rainbow trout and occasionally brown trout. Watersports enthusiasts utilize the lake for kayaking, canoeing, paddleboarding, and open-water swimming. Several mountain bike trails ranging from blue to black grade are integrated into the surrounding woodland. The landscape comprises a mix of mature coniferous plantations, deciduous woodland, and open grassland managed to support local biodiversity. The site is a primary destination for outdoor education and regional recreation in West Wales.
The crest of the dam wall provides a panoramic view across the length of the reservoir toward the Preseli Hills.
Check the official website for reservoir water quality status before planning a swimming session.
Bring a windbreaker, as the open expanse of the reservoir can experience strong gusts even on clear days.
Bike rentals are available on-site, which is useful if you do not want to transport your own equipment.
Attempting to swim in the reservoir outside of designated zones or sanctioned event hours.
Clean, check, and dry all watercraft and equipment to prevent the spread of invasive aquatic species; keep dogs on leads in livestock-adjacent areas.
