Best natural monuments around Corris are situated within the Dyfi Forest in Southern Snowdonia, Wales. This region features a diverse landscape of ancient woodlands, prominent mountains, and serene lakes. Corris offers opportunities to explore its geological and ecological heritage through various natural sites. The area is known for its significant natural beauty and varied terrain, making it ideal for walking routes and popular hiking trails.
Last updated: July 1, 2026
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According to legend, Cader is named after a giant called Idris Gawr. 'Cadair Idris' means 'Chair of Idris' in English, while 'Cader' can also refer to an ancient fortress. The place is known as Cader Idris rather than Cadair, but both names are used. The most famous local fable is that if you spend the night on the mountain, you will go mad or become a poet. (Visit Wales)
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It is worth the effort. At the top, you enjoy a beautiful view in all directions. It cannot be captured in photos.
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A very fine mountain that benefits from being a bit off the beaten track, so you are unlikley to see many other people up here. The cliffs on the easten side areabout a thousand feet high.
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First, a somewhat adventurous ride on the single track to the parking lot, which costs £5. The easy loop around the lake is very beautiful and relaxing – the sheep roam freely, but they keep their distance. Dogs must be on a leash, of course, but that's not a problem. Enjoy it – and if you're up for more, go for a longer loop. There are a few tables and benches above the parking lot for your picnic. You won't find any litter baskets, so you'll have to take them with you – which is perfectly fine, as it's a nature reserve. Highly recommended.
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The battered trig point on Aran Fawddwy is built of blocks rather then being a concrete lump, and it's exposed and airy position does mean it is on the receiving end of a lot of weather.
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A circular walk through the historical Nannau estate and along the shore of Llyn Cynwch The Precipice has a fantastic array of qualities. From habitats such as woodlands and meadows to captivating views of Snowdonia’s mountain ranges. The path will take you through part of the Nannau estate which dates back to the 12th century and is steeped in fascinating Welsh history. The route ends on the shores of Llyn Cynwch—a working reservoir that provides nearby Dolgellau with water.
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Llyn Cynwch acts as both a 'prequel' and 'sequel' to the Precipice Walk, one of the most famous and popular walks in the area with breathtaking views. You'll get a glimpse of the lake if you take the route counterclockwise and you'll see it in all its glory if you finish the walk with a nice, steady stroll along the banks. Together with the Precipice Walk it is part of the historic Nannau estate and is a working water basin that has supplied drinking water for Dolgellau since 1968. Because it is a water basin, swimming is not allowed. (DOLGELLAU.uk)
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The rocky and remote summit of Aran Fawddwy stands at 905 m. It's the only peak in Wales outside the northern Snowdonia range over 900 m. It's a tough run to the summit where ever you start from but the views are great and the descent via Hengwm is awesome!
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The Corris area, nestled within the Dyfi Forest, offers a diverse range of natural features. You'll find majestic mountains like Cadair Idris and Aran Fawddwy, serene lakes such as Llyn Cau, Llyn Cynwch, and Cregennan Lakes, ancient broadleaved woodlands like the Aber Corris Nature Reserve, and even hidden waterfalls within old slate quarries.
Yes, there are options suitable for families. The Cregennan Lakes are noted as family-friendly and offer accessible parking. While some mountain trails can be challenging, easier walks can be found within the Dyfi Forest. The Aber Corris Nature Reserve also offers woodland trails, though some sections can be steep.
The region offers numerous hiking opportunities. For challenging walks, the ascent to Penygadair summit, Cadair Idris, is very popular, offering striking views. You can also find easy hikes, such as the 'Corris – Idris Stores loop from Corris Uchaf' or 'Tal-y-llyn Lake loop from Dolffanog Fawr'. For more options, explore the hiking routes around Corris.
While some mountain lakes like Llyn Cau on Cadair Idris are mentioned as places where you can swim, it's noted that you need a 'cast-iron constitution' due to the cold water. However, swimming is explicitly not allowed in Llyn Cynwch as it is a working water basin supplying drinking water.
The Aber Corris Nature Reserve is a vital wildlife corridor within the Corris valley, offering a chance to see a variety of flora and fauna in its ancient broadleaved woodland. The Afon Deri, which runs through the reserve, is also a spawning ground for salmon. The broader Dyfi Forest and mountain areas are home to diverse birdlife and other native species.
For easier exploration, the Cregennan Lakes offer accessible paths and beautiful scenery. The Aber Corris Nature Reserve has public footpaths, though some sections can be steep. For specific easy hiking routes, you can check out easy hikes around Corris.
The region's natural beauty can be enjoyed year-round, but each season offers a different experience. Spring and summer provide lush greenery and warmer temperatures ideal for hiking. Autumn brings vibrant foliage to the woodlands. Winter walks can be stunning, especially in the mountains, but require appropriate gear and caution due to potentially harsh conditions.
Many outdoor areas in the Dyfi Forest and around the natural monuments are dog-friendly. However, when visiting sensitive areas like the Aber Corris Nature Reserve, it's important to keep dogs on leads, especially near the river where salmon spawn, to protect wildlife and ensure safety on steep paths.
For a challenging experience, the ascent to Penygadair summit, Cadair Idris, is a demanding but rewarding hike with complex and striking views. Another significant challenge is the Summit of Aran Fawddwy, which is the UK’s highest mountain south of Snowdon, offering expansive views across Snowdonia from its rocky and remote peak.
Yes, the expansive Dyfi Forest surrounding Corris is well-known for its cycling opportunities. You can find various routes for gravel biking, including challenging options like the 'Nant y Moch loop' or the 'Mach 1, 2, and 3 Loop'. For more details, refer to the gravel biking guide around Corris.
Cadair Idris, meaning 'Chair of Idris', is a prominent mountain renowned for its imposing cliffs, enticing ridges, and scenic tarns like Llyn Cau. It's steeped in Welsh legend, adding a mythical ambiance to its already stunning natural beauty. The Penygadair summit offers complex and striking views, making it a popular destination for challenging walks.
The Aber Corris Nature Reserve is a three-acre woodland site on the steep east bank of Afon Deri, known for its ancient broadleaved woodland and as a vital wildlife corridor. You can find more information about this significant natural area on external tourism sites like Visit Wales or Visit Mid Wales.


Extend your search for the best caves by checking out these guides of the top ones around Corris: