The name 'Ceunant Mawr' translates from Welsh as 'Great Ravine' or 'Big Chasm'.
The waterfall's path was significantly altered by the extraction of slate in the surrounding quarries during the 19th century.
The drop occurs in two distinct stages, with the upper portion obscured by the gorge walls from most lower-level viewing angles.
The site is designated as a Site of Special Scientific Interest (SSSI) due to its unique geological exposures and rare bryophyte populations.
The base of the falls is situated at an elevation of approximately 100 metres above sea level.
Ceunant Mawr is a dramatic, multi-tiered waterfall located on the Afon Arddu in Llanberis, dropping roughly 30 metres into a deep, steep-sided gorge. The cataract is fed by the waters descending from the northern slopes of Snowdon, specifically the Cwm Glas area. The site is a prominent feature along the ascent route to the Snowdon summit via the Llanberis Path. The waterfall's flow rate fluctuates significantly based on recent rainfall, often narrowing to a thin veil during dry spells and becoming a powerful torrent during storm events. The surrounding terrain consists of jagged slate outcrops, reflecting the region's industrial geological history. A railway bridge crosses high above the gorge, providing a unique vantage point where the Snowdon Mountain Railway train occasionally passes directly over the falls.
From the bridge path overlooking the gorge, allowing for a framed shot of the waterfall with the railway line visible above.
Wear footwear with high-traction soles, as the rocky paths near the ravine are frequently wet and slippery.
Follow the designated fenced paths to view the falls, as the gorge edges are unstable and steep.
Visit after a period of heavy rainfall to witness the waterfall at its most powerful volume.
Attempting to swim in the pool at the base of the falls, as the water temperatures are dangerously low and currents are unpredictable.
Stay behind safety barriers; do not attempt to climb the damp, unstable slate rocks near the water's edge.
