The vertical cliffs represent a deltaic sequence formed by an ancient river system flowing into a deep sea.
The base of the cliffs features large, cross-bedded sandstone features known as 'delta lobes'.
The cliff face acts as a natural habitat for at least 20 species of seabirds including guillemots and razorbills.
The site was a finalist in the New7Wonders of Nature campaign.
Local geology reveals fossilized tracks of giant prehistoric creatures in the flagstone layers.
The cliffs were used as a filming location for the 2009 Harry Potter and the Half-Blood Prince production.
Erosion rates are monitored annually, as the softer shale layers beneath the sandstone are prone to slumping.
The name Moher derives from a now-demolished promontory fort, 'Mothar', which once stood on Hag’s Head.
The Cliffs of Moher are a series of sea cliffs rising to 214 meters above the Atlantic Ocean in County Clare. The rock formation consists primarily of Namurian shale and sandstone layers deposited approximately 300 million years ago. O'Brien's Tower, located at the highest point of the cliffs, was constructed in 1835 as an observation point for Victorian tourists. The site is a designated Special Protection Area for seabirds, hosting over 30,000 breeding pairs including Atlantic puffins. The Coastal Walk path extends 18 kilometers between the villages of Doolin and Liscannor, providing direct access to the cliff edges. Facilities include a sod-roofed subterranean visitor center integrated into the hillside to minimize visual impact. The cliffs form part of the Burren and Cliffs of Moher UNESCO Global Geopark. Weather conditions can change rapidly due to the exposed coastal location, impacting visibility and safety.
The elevated vantage point just north of the visitor center looking back toward O'Brien's Tower.
Walk at least 15 minutes past the main viewing platforms toward the North or South paths to escape the densest crowds.
Check the local coastal weather forecast specifically for wind speeds before arrival, as gusts can exceed 80 km/h.
Wear moisture-wicking layers and a windproof jacket, as the temperature is significantly lower at the cliff edge than in the parking area.
Do not attempt to walk along the unprotected cliff edges during high winds or rain. Do not rely on parking in village laybys as they are strictly enforced.
The site remains open year-round, though the visitor center experience may close briefly on December 24-26.
Stay strictly within fenced areas; cliff edges are unstable and prone to sudden erosion. Keep dogs on a leash at all times.
