Category 5: Adventurous

Whether it’s climbing, caving, hiking, diving, or just the logistics of travelling to beautiful and remote places, these sites all present a particularly adventurous challenge!
(Visiting some of these sites requires specialist skills – please take care, and seek expert advice where appropriate.)
Click on the links below to find out about each Geosite:
![]() |
Porth yr Ogof CavesBrecon Beacons, Wales Porth yr Ogof is a cave located in the Brecon Beacons National Park. Its name means ‘the mouth of the cave’ in Welsh owing to the size or the entrance. It is situated in a narrow band of carboniferous limestone. |
![]() |
Gaping GillYorkshire Dales, England A natural cave in North Yorkshire, Gaping Gill is a 98 metre deep pothole. Fell Beck stream flows into it, eventually resurging adjacent to Ingleborough Cave. ![]() |
![]() |
StaffaInner Hebrides, Scotland The island of Staffa is entirely of volcanic origin, consisting of a basement of tuff, underneath colonnades of a black fine-grained Tertiary basalt, overlying which is a third layer of basaltic lava. ![]() |
![]() |
The Cuillin
|
![]() |
Snowdon / Y Wyddfa
|
![]() |
Mixon Hole Deep Water GullyEnglish Channel off Selsey Bill, West Sussex, England Thought to be a river bed from Biblical times, Mixon Hole forms a 30 m deep underwater gully which was use by the Romans to transport goods. |
![]() |
UyeaUnst, Shetland Isles, Scotland An uninhabited tidal island, Uyea can be reached on foot from the Northmavine peninsular at low tide. Its rocky coast features several natural arches. ![]() |
![]() |
St KildaOuter Hebrides, Scotland St Kilda is an isolated archipelago in the North Atlantic Ocean. The islands are composed of Tertiary igneous formations of granites and gabbro which have been heavily weathered by the elements. |
![]() |
Old Man of Hoy and St John’s HeadHoy, Orkney, Scotland The impressive and famous Old Man of Hoy is a well known sea stack on Orkney formed from sandstone and the sea cliffs at nearby St John’s Head are some of the highest in the UK. |
![]() |
The NeedlesIsle of Wight, English Channel Popular with climbers and probably the most well known and visited spectacle on the Isle of Wight Island. On clear days you can see Old Harry Rocks in Dorset, which shows quite clearly how the Island was once linked with Dorset. |