The 'Big Dipper' dune is one of the tallest in the United Kingdom, reaching heights of approximately 60 meters.
Scenes from the 1962 film 'Lawrence of Arabia' were filmed here to replicate the deserts of the Middle East.
The reserve protects the ruins of Candleston Castle, a fortified 14th-century manor house that was partially buried by shifting sands.
The site hosts a unique population of the rare sand lizard, which is legally protected in the UK.
Archaeologists have discovered remains dating back to the Neolithic period, including chambered tombs.
The dunes move slowly inland over time, occasionally revealing and then re-covering historical artifacts and structures.
The reserve supports a significant population of the rare shrill carder bee.
Merthyr Mawr Nature Reserve features the second-highest sand dune system in Europe, known as the Big Dipper. The reserve encompasses 840 acres of diverse habitats, including salt marshes, limestone grassland, and coniferous woodland. It is designated as a Site of Special Scientific Interest due to its rare flora and fauna, including endangered species of fungi and insects. The area contains historical archaeological sites, ranging from Bronze Age burial mounds to medieval church ruins. The dunes are highly mobile and constantly reshaped by prevailing winds from the Bristol Channel. Access to the beach at Candleston requires traversing the dune system. The reserve provides critical nesting grounds for several species of ground-nesting birds. The shifting landscape obscures trails, making the terrain physically demanding for walkers.
The summit of the Big Dipper at golden hour looking towards the Bristol Channel.
Wear sturdy footwear with high ankle support, as walking on shifting sand is physically strenuous.
Bring a compass or GPS, as trails are frequently buried or redirected by changing wind patterns.
Carry sufficient water, as there are no facilities or potable water sources within the dune system.
Attempting to cross the dunes in high wind conditions, as sand blindness can occur; wandering off marked paths during sensitive wildlife breeding cycles.
Keep dogs under close control during bird nesting season; do not climb on historical ruins; take all litter away.
