Best canyons around Porthmadog are primarily found within the surrounding Snowdonia (Eryri) National Park, characterized by spectacular gorges and deep, wooded ravines. These natural formations feature cascading waterfalls and rock features shaped by water flow. The region offers a blend of natural beauty and opportunities for gorge walking and canyoning. Porthmadog serves as a base for exploring these natural riverine landscapes.
Last updated: June 30, 2026
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The bridge was probably built in the 17th century and then radically rebuilt and widened in 1795-1796. As with many older bridges, folk tales claimed that the bridge was built by the devil or by the Romans (which an investigation by the National Trust described as "very doubtful"). During the reconstruction, a stone was found with the inscription "W M 1656" scratched on it, suggesting that the bridge is at least that old. Pont Aberglaslyn is located near the downstream end of the Aberglaslyn Pass. Although the location is rocky and the river flows through rapids upstream, it is not far above sea level. (Wikipedia)
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Gorgeous but a little challenging in places. Can be very busy
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Great walk through a variety of tree species and easy to follow path. Would recommend going anti clockwise/reverse of suggested route as scenery coming back through gorge is stunning (with the bridge as a nice suprise at the end) and easier downhill as plenty of small steps. If taking a dog then be aware there is/are sheep grazing along the route but no stiles or fences to climb if you have a large dog but there are very steep banks/drops along the gorge so recommend keeping on a lead if they are a bit hectic! Would not recommend unless you have a basic level of fitness as some parts of the path are extremely steep.
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We followed the river upstream through the Aberglaslyn pass. The narrow path along the river requires some skill. At certain points you have to be very careful, especially in rain or when the water is high. However, you walk through a narrow gorge of considerable beauty, with beautiful views of a sometimes very turbulent river, rapids etc. In short, a very beautiful area.
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A lovely riverside walk, with beautiful views
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The Pass of Aberglaslyn is a magnificent, rocky gorge to the south of Beddgelert. It speeds the Afon Glaslyn on this part of its long journey from high on the slopes of Yr Wyddfa (Snowdon) towards where it meets the sea at Tremadog Bay. The rocky trail here can be slippery when wet, so take care.
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Varied route where you don't just walk along. Magnificent views! And if you're lucky, you'll see otters hunting! You can't see the road that runs parallel to the river - partly because of the noise of the water and partly because of the vegetation on the bank.
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The Snowdonia National Park, easily accessible from Porthmadog, offers thrilling gorge walking and canyoning. These guided adventures often involve natural water slides, waterfall abseiling, cliff jumps into plunge pools, wild swimming, and scrambling over boulders. Some locations even feature via ferrata-style waterslides, providing an adrenaline-pumping experience amidst breathtaking scenery.
Absolutely. Ceunant Llennyrch National Nature Reserve, located about 8.5 miles east of Porthmadog, is a deep, wooded gorge with cliffs up to eighty feet high. The Afon Prysor river dramatically cascades through it, forming spectacular waterfalls like Rhaeadr Ddu. The area is also home to ancient oak woodland, offering a unique 'rainforest' atmosphere. Another stunning area is The Aberglaslyn Pass and the Glaslyn River Gorge, known for its narrow, beautiful ravine and turbulent river.
Walking trails vary in difficulty. For instance, a strenuous 1-mile trail allows visitors to explore Ceunant Llennyrch. The path through The Aberglaslyn Pass is narrow and can be challenging, especially after rain or high water, requiring careful footing. Some sections have handrails. It's crucial to wear good footwear as paths can be uneven and slippery. For a different experience, the area around Waterfall in Parc Cenedlaethol Eryri offers a great walk through varied tree species with an easy-to-follow path, though some parts are extremely steep.
The path through The Aberglaslyn Pass is considered challenging. It's a narrow riverside path that requires skill and careful attention, especially in wet conditions or when the river is high. Some sections are exposed, and while handrails are present in places, it's not recommended during 'spate' conditions when much of the path can be underwater. Visitors should have a basic level of fitness and wear appropriate footwear.
While some gorge activities are adventurous, many providers offer family-friendly gorge scrambling experiences in Snowdonia. These typically involve navigating through refreshing pools and scrambling over boulders with avoidable obstacles, making them suitable for various skill levels. For walks, some sections of the Waterfall in Parc Cenedlaethol Eryri trail can be enjoyed by families with a basic level of fitness, though steep sections exist.
Near the Aberglaslyn Pass, you can find Pont Aberglaslyn, a Grade II-listed, 17th-century stone bridge. This famously romantic beauty spot offers a great place to pause and watch the Afon Glaslyn cascading towards the sea, providing a blend of beautiful architecture and natural scenery. Another nearby historical feature is the Stone Bridge over Afon Glaslyn, also a grade 2 listed 17th-century construction.
The gorges and their surrounding ancient oak woodlands thrive in the mild, wet climate and high humidity, making them beautiful year-round. However, for gorge walking and canyoning activities, the warmer months from late spring to early autumn (May to September) are generally preferred for more comfortable water temperatures. For walking trails, be aware that paths can be wet and slippery after heavy rain, so checking weather conditions is always advisable.
Beyond exploring the gorges, the Porthmadog area offers a variety of outdoor activities. You can find numerous MTB Trails, including routes like the 'Pen-y-Pass – Telegraph Valley loop'. There are also many easy hikes, such as the 'Borth-y-Gest – The Glaslyn Estuary loop', and family-friendly hikes like the 'Moel-y-Gest and Borth-y-Gest Loop'.
Yes, the region is home to impressive waterfalls. In Ceunant Llennyrch National Nature Reserve, the Afon Prysor river creates spectacular cascades, including the prominent Rhaeadr Ddu (black waterfall). Additionally, you can visit the Waterfall in Parc Cenedlaethol Eryri, which is part of a scenic walk through a wooded gorge.
The ancient oak woodlands and temperate rainforest environments within the gorges, such as those at Ceunant Llennyrch, support diverse damp-loving plants and a rich ecosystem. While specific large wildlife sightings are not guaranteed, these habitats are crucial for various bird species, insects, and smaller mammals. If walking with a dog, be aware that sheep graze along some routes, particularly near Waterfall in Parc Cenedlaethol Eryri, so keeping them on a lead is recommended.
In Snowdonia, gorge scrambling typically involves navigating upstream through a river gorge by walking, wading, scrambling over rocks, and sometimes swimming in pools. It's often seen as a more accessible, family-friendly activity. Canyoning, on the other hand, is generally a more advanced activity that involves descending a gorge, often incorporating techniques like abseiling down waterfalls, jumping into deep plunge pools, and sliding down natural rock slides. Both offer unique ways to experience the natural beauty of the gorges.


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