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Monmouthshire

Top 5 Caves in Monmouthshire

Best caves in Monmouthshire are found within a region characterized by its diverse natural landscape, including the Wye Valley and its ancient geological formations. This area features a mix of natural limestone caves and historical mining complexes. The landscape is shaped by carboniferous limestone, offering unique underground environments. Monmouthshire's caves provide insights into geological history and past human activity.

Best caves in Monmouthshire

  • The most popular caves is Giant's Cave, Wye Valley, a natural cave and viewpoint that offers outstanding views of the River Wye. It is a curving tunnel cut into the rock-face, part of the Picturesque Piercefield trail.
  • Another must-see spot is Otter Hole Cave, a natural monument known as one of the most "decorated" caves in the UK. Access is restricted to protect its rare formations, and it is managed by the Royal Forest of Dean Caving Club.
  • Visitors also love Gloucester Hole, a natural monument and historical site. This cave can be seen from the opposite bank of the Wye and is historically associated with smuggling.
  • Monmouthshire is known for its natural caves, historical mining complexes, and grottoes. The region offers a variety of underground experiences, from geological formations to sites with historical significance.
  • The caves in Monmouthshire are appreciated by the komoot community, with more than 140 upvotes and 45 photos shared by users.

Last updated: April 23, 2026

Giant's Cave, Wye Valley

Highlight • Cave

There are a couple of caves in this area. The first (coming from Chepstow) is very shallow and raided above the path.

The second "Giant Cave" has outstanding safe viewing platform outside it, and the cave actually opens into a secondary exit allowing passage through the rock.

This is a natural formation it would appear. Highly recommended!

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Otter Hole Cave

Highlight • Natural Monument

Otter Hole / Otter Cave is known as one of the best "decorated" caves in the UK. Access is restricted to protect the rare formations inside. The cave also floods, with a tidal sump. It is managed by the Royal Forest of Dean Caving Club.

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Gloucester Hole

Highlight • Natural Monument

Can be seen from the opposite bank (Chepstow side) Gloucester Hole, smuggling, storage of tea, explosives or other smuggled goods?? Marked with a Union Jack and only accessible at high tide!

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Tips from the Community

Jordan Jenkins
July 22, 2025, Giant's Cave, Wye Valley

The Giant's Cave is a small pass through cave with a great view of the River Wye and Landscape

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There are a couple of caves in this area. The first (coming from Chepstow) is very shallow and raided above the path. The second "Giant Cave" has outstanding safe viewing platform outside it, and the cave actually opens into a secondary exit allowing passage through the rock. This is a natural formation it would appear. Highly recommended!

1

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Andy Bryant
February 16, 2025, Gloucester Hole

Can be seen from the opposite bank (Chepstow side) Gloucester Hole, smuggling, storage of tea, explosives or other smuggled goods?? Marked with a Union Jack and only accessible at high tide!

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This striking feature is a curving tunnel that is cut into the rock-face through which Piercefield Walk passes via a large opening in the southern side, and a smaller rectangular portal in the northern. It is part natural feature, and part hand-made.

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Adie
January 10, 2023, Otter Hole Cave

Otter Hole / Otter Cave is known as one of the best "decorated" caves in the UK. Access is restricted to protect the rare formations inside. The cave also floods, with a tidal sump. It is managed by the Royal Forest of Dean Caving Club.

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It would have to be a very small giant to fit through there! Amazing feature... look out for the bats!

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Frequently Asked Questions

What types of caves can I explore in Monmouthshire?

Monmouthshire offers a diverse range of underground experiences, from natural geological formations to historical mining complexes and grottoes. You can find natural limestone caves like Giant's Cave, Wye Valley, and sites with significant historical context such as King Arthur's Cave.

Are there any caves in Monmouthshire with historical significance?

Yes, Gloucester Hole is a natural monument and historical site historically associated with smuggling. King Arthur's Cave in the Wye Valley is notable as one of only five caves in the UK used as a dwelling by early man during the Upper Palaeolithic era. Clearwell Caves, just outside Monmouthshire, are ancient iron mines with a rich history spanning over 4,500 years.

Which caves in the Monmouthshire area are suitable for families?

Clearwell Caves, located just outside Monmouthshire in Gloucestershire, are highly recommended for families. They offer a self-guided 550-meter route through ten caverns, providing an engaging and educational experience. Dewstow Gardens & Grottoes in Monmouthshire also offers a family-friendly visit with its historical gardens and underground grottoes.

Can I visit Otter Hole Cave, known for its rare formations?

Access to Otter Hole Cave is restricted to protect its rare and delicate formations. It is managed by the Royal Forest of Dean Caving Club and is primarily for serious cavers due to its challenging conditions, including a tidal sump and flooding.

What kind of views can I expect from caves in Monmouthshire?

The Giant's Cave, Wye Valley, offers outstanding views of the River Wye and the surrounding landscape from its safe viewing platform. It's part of the Picturesque Piercefield trail, providing scenic vistas.

Are there opportunities for guided caving adventures in the Monmouthshire area?

Yes, Borderlands Outdoor, based in Monmouth, organizes guided excursions into the 350-million-year-old tunnels beneath the Wye Gorge. These trips offer an introduction to caving for those interested in a more adventurous underground experience.

What outdoor activities can I do near the caves in Monmouthshire?

The region around Monmouthshire's caves offers various outdoor activities. You can find numerous hiking trails, such as those in the Wye Valley or near the Brecon Beacons National Park. For cycling enthusiasts, there are options for gravel biking and road cycling routes, including loops around the Wye Valley and Forest of Dean. Explore hiking routes in Monmouthshire for more details.

What is the best time to visit the caves in Monmouthshire?

The best time to visit depends on the specific cave and your activity. For outdoor caves like Giant's Cave, spring and autumn offer pleasant weather for walking the surrounding trails. For indoor attractions like Clearwell Caves, they are accessible year-round, making them a good option regardless of weather conditions.

Are there any easy-access caves or grottoes in Monmouthshire?

Dewstow Gardens & Grottoes provides an accessible experience with its historical gardens and underground grottoes, making it suitable for a wider range of visitors. While Giant's Cave is part of a walking trail, it features a safe viewing platform for easy enjoyment of the views.

What is the geological background of the caves in Monmouthshire?

The caves in Monmouthshire are primarily formed within carboniferous limestone, which dates back 400-350 million years. This geological composition has created unique underground environments, including natural formations like King Arthur's Cave and the extensive systems found in the Wye Valley.

Where can I find more information about Clearwell Caves?

For detailed information on visiting Clearwell Caves, including opening times and facilities, you can visit their official listing on the local tourism website: visitdeanwye.co.uk.

Are there any caves in Monmouthshire that are part of longer walking trails?

Yes, Giant's Cave, Wye Valley, is a notable feature along the Picturesque Piercefield trail, which is part of the wider Wye Valley Walk. This allows visitors to combine cave exploration with scenic hiking.

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Didn’t find what you were looking for?

Discover more caves in Monmouthshire region by region:

St ArvansDevaudenWye ValleyPortskewettChepstowCaerwentMathernRogietTrellech UnitedCaldicotShirenewtonSt. Arvans

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