Best mountain passes around Arthog are located in Gwynedd, North Wales, a region characterized by its mountainous landscape. A mountain pass in this context is a navigable route through a mountain range or over a ridge, often representing a low point that allows access for travel. The area offers a variety of scenic routes, providing distinct experiences for exploration.
Last updated: May 3, 2026
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Great mountain road, rideable on a gravel, comfortable on an MTB
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This is the first proper off-road section on Traws Eryri heading north. If you're riding an MTB with nice big tyres it's a blast, but if you're on a gravel bike, it's a long, picky descent.
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Heading south, this is a great, usually traffic-free descent. Heading north it's a hard climb with some 15%+ ramps especially towards the top.
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Heading south, once you're away from the main road this is a lovely steady climb with a few steep ramps. Look out for plane-spotters who hang-out at the top waiting for military aircraft doing the low-flying 'Mach Loop'.
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Easy parking stop to explore the Cloddfa Gwanas slate quarry & Cribin Fawr
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It's a long slog of a climb from the south - but don't despair the scenery is amazing, and well worthy of every pedal stroke.
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A superb gravel ride! Surface was quite loose at the north end, which was challenging on a loaded bike. The views across the estuary to Barmouth are simply breath-taking. And to top it all there's an epic descent towards Tywyn at the south end - be wary of the cattle grids!!
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The mountain passes around Arthog offer diverse and stunning views. For breathtaking coastal vistas, the Black Road Gravel Pass provides amazing views of Barmouth and its bay from high above the coast. Other passes, like the Aberllefenni Slate Quarry Cycle Route, offer panoramic views of the surrounding Gwynedd countryside and, on clear days, distant peaks of Snowdonia. Bwlch y Rhiwgyr offers fantastic views of both Snowdon and Cadair Idris.
Yes, the Aberllefenni Slate Quarry Cycle Route is particularly notable for its combination of historical interest and natural splendor. This route connects old slate mining villages and allows visitors to explore the enduring remnants of centuries of slate mining and industrial heritage, including unique stone fences instead of wooden ones. Bwlch Oerddrws Pass is also near the Cloddfa Gwanas slate quarry.
For the Black Road Gravel Pass, the gravel surface can be loose in parts but is suitable for touring, hybrid, gravel, and mountain bikes. The Aberllefenni Slate Quarry Cycle Route is a cycle path, though it can be narrow and uneven. The Minor Road Pass in Parc Cenedlaethol Eryri is also popular with cyclists.
Absolutely. The Aberllefenni Slate Quarry Cycle Route, when heading north, presents a long and tough climb. Similarly, the Minor Road Pass in Parc Cenedlaethol Eryri involves a steady climb with steep ramps, especially if riding south. The Black Road Gravel Pass is also considered a challenging yet rewarding gravel ride.
Beyond exploring the passes themselves, the Arthog area offers a variety of outdoor activities. You can find numerous MTB trails, including routes like the Mawddach Trail and loops around Cregennan Lakes. There are also many easy hikes, such as those around Cregennan Lakes and to Arthog Waterfalls. For gravel biking enthusiasts, there are dedicated gravel biking routes that incorporate parts of the Mawddach Trail and the estuary.
Given the exposed nature of some passes, like the Black Road Gravel Pass, it's essential to bring appropriate clothing as weather conditions can change rapidly. Layers are recommended, along with waterproofs, even on clear days. For cycling, ensure your bike is suitable for gravel or uneven surfaces, and always carry water and snacks.
While some passes can be challenging, the wider Arthog area offers family-friendly options. The easy hikes around Arthog guide features routes like those around Cregennan Lakes and the Barmouth Viaduct, which are generally suitable for families. These provide gentler terrain and beautiful scenery without the intensity of some of the higher passes.
The Black Road Gravel Pass is highly regarded for its breathtaking coastal views and the sense of solitude it offers. It winds around the western extreme of Cadair Idris, providing exceptional views of Barmouth and its bay. Visitors praise it as an amazing gravel pass, especially at sunset, and a superb gravel ride despite some loose surfaces.
Yes, many passes offer excellent viewpoints. The Black Road Gravel Pass provides amazing views of Barmouth and its bay. The Minor Road Pass in Parc Cenedlaethol Eryri is itself a viewpoint pass. Additionally, Bwlch y Rhiwgyr offers fantastic views of both Snowdon and Cadair Idris from its saddle.
The Aberllefenni Slate Quarry Cycle Route stands out for its blend of natural beauty and significant industrial archaeology. It climbs to over 400 meters above sea level, connecting old slate mining villages. A unique feature is the use of stone fences instead of wood, a testament to the area's rich history of slate quarrying. Visitors can see remnants of this heritage, including slag heaps, while enjoying impressive Welsh landscapes.
While the guide doesn't specify winter conditions for each pass, the exposed nature of routes like the Black Road Gravel Pass means that weather can change quickly. In winter, expect colder temperatures, potentially icy or snowy conditions, and shorter daylight hours. Always check local weather forecasts, carry appropriate winter gear, and be prepared for more challenging terrain and reduced visibility.
The Bwlch Oerddrws Pass is a gap in southeastern Meirionnydd, Gwynedd, crossed by the A470 highway. At 360 meters above sea level, it is a very popular pass for both cyclists and hikers. It's also a convenient stop to explore the nearby Cloddfa Gwanas slate quarry and Cribin Fawr.


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