20 geological wonders of the world

Rough Guides Editors

written by
Rough Guides Editors

updated 07.06.2024

With age comes stories, and the stories our old Earth tells can be seen in its rock formations. Here are 20 of the most astonishing geological wonders of the world.

1. The Danakil Depression, Ethiopia

From Tanzania to Eritrea, the earth is being wrenched apart along the Great Rift Valley and will one day form a new ocean. Volcanic activity abounds along this rift, particularly in the Danakil Depression. This dramatic region is home to more than thirty young volcanoes, sulphurous yellow hot springs and otherworldly salt plains. Check with the Foreign Office before travelling, as this is a geologically and politically volatile area.

Dallol, Danakil Depression, Ethiopia © Lukas Bischoff Photograph/Shutterstock

Dallol, Danakil Depression, Ethiopia © Lukas Bischoff Photograph/Shutterstock

2. Cal Orko, Bolivia

Not only is Cal Orko home to the world’s largest group of dinosaur footprints – over 5000 of them – but nature has also kindly presented them for your viewing pleasure on an 80m-high vertical rock face. You could be forgiven for thinking that dinosaurs could walk up walls, but in fact the land surrounding this ancient watering hole was itself shifted skywards by subsequent tectonic movements.


© Byelikova Oksana/Shutterstock

3. Parc National de l’Ankarana, Madagascar

Arriving at Parc National de l’Ankarana feels not unlike taking your first steps onto another planet. Gangly-limbed lemurs bounce effortlessly from ridge to ridge of this intricate rocky maze, comprised of spiky limestone pinnacles that have been eroded by water. Down below, scorpions take refuge in hidden crevices and crocodiles cruise the underground rivers that flow between secret pockets of forest.


© Pierre-Yves Babelon/Shutterstock

4. Colca Canyon, Peru

More than twice as deep as the Grand Canyon and thought to be the second-deepest canyon in the world, Peru’s Colca Canyon is totally breathtaking. Created by a massive geological fault between two huge volcanoes, there is still evidence of pre-Inca terracing on its slopes. The Mirador Cruz del Condor is the most popular spot to take in the views and watch soaring condors.


© Lukasz Kurbiel/Shutterstock

5. Underground river, Palawan, The Philippines

A secret world all of its own, the Cabayugan snakes along for 8.2km underneath the karst landscape of the Puerto Princesa Subterranean River National Park. The waterway has eroded a series of vast chambers on its journey, which are full of stalactites and stalagmites – not to mention more than 400,000 bats – before it eventually flows out into the open South China Sea.

Puerto Princesa - boat heading into the cave © jesper olsson/Shutterstock

Puerto Princesa - boat heading into the cave © jesper olsson/Shutterstock

6. Mingsha singing sand dunes, China

While you probably won’t see them appearing on X Factor any time soon, the Gobi Desert’s singing sand dunes are still a captivating curiosity. As visitors camel trek along the spine of the dunes and the wind whips up the towering sands they emit an unmistakable humming sound; the phenomenon is thought to be the result of avalanching grains bouncing off each other.

Oasis in desert at Mingsha Shan, Dunhuang, Gansu Province, China © Nithid/Shutterstock

Oasis in desert at Mingsha Shan, Dunhuang, Gansu Province, China © Nithid/Shutterstock

7. Mount Roraima, Brazil/Guyana/Venezuela

It’s not hard to see why Roraima has been cited as the inspiration for Sir Arthur Conan Doyle’s The Lost World. One of the oldest rock formations on earth, it’s hard to believe that this mist-shrouded table-top mountain (or tepui) is made up of sediments that used to sit on the seabed. Almost 3000m tall, Roraima is threaded with stunning silvery waterfalls and lush jungle.

Mount Roraima in Venezuela © Marcelo Alex/Shutterstock

© Shutterstock

8. Knockan Crag, Scotland

Huge geological forces once pummelled and folded the mountains around Knockan like puff pastry. A huge section of young rocks (a mere 500 million years old) were squeezed on top of some of the world’s oldest (which had over 1.5 billion candles to blow out on their last birthday). Scoured by glaciers and gnawed at by the sea, the resulting scenery is bleak but beautifully striking.


© LouieLea/shutterstock

9. Thrihnukagigur Volcano, Iceland

Hard to pronounce, Thrihnukagigur offers the unique opportunity to descend into the bowels of a dormant volcano, which last erupted over 4000 years ago. Tours involve a 45-minute hike over a lava field and a thrilling 120m descent into the empty magma chamber in an open cable lift. The crater is vast – big enough to house the Statue of Liberty – and the rocks are kaleidoscopic.

Iceland Inside The Volcano Thrihnukagigur © Enken/Shutterstock

Iceland Inside The Volcano Thrihnukagigur © Enken/Shutterstock

10. Kilauea Volcano, Hawaii, USA

Sitting as it does in the middle of the Pacific Ocean, above an intense volcanic hotspot, the rocks beneath Hawaii are constantly simmering away, and continuously creating new land. Kilauea is a shallow-profile shield volcano from which ropey, pahoehoe lava meanders overland and through subterranean tunnels all the way to the ocean, where it drips and sizzles into the waters below like pancake batter.

Kilauea volcano, Hawaii ©Alex GK Lee/Shutterstock

Kilauea volcano, Hawaii © Alex GK Lee/Shutterstock

11. The Blue Hole, Belize

Staring out of Belize’s Lighthouse Reef atoll like the pupil of an enormous aquatic eye, it’s hard to imagine that this giant sinkhole once sat above sea level. Perfectly spherical, the Blue Hole is full of stalactites and stalagmites that were initially created above-ground, and has become a popular site for divers, including the likes of Jacques Cousteau.

Coral reef deep cave Blue Hole, Belize © Tami Freed/Shutterstock

Coral reef deep cave Blue Hole, Belize © Tami Freed/Shutterstock

12. Antelope Canyon, Arizona, USA

Antelope Canyon’s undulating sandstone walls have been smoothed and polished to perfection by years of rainwater and flooding. The slot canyon is still prone to flash floods on occasion, but visit on a fair weather day and you’ll be in for a treat, as the walls turn burning shades of amber, bronze and gold in the shafts of sunlight that peek through from above.


Antelope Canyon lights and rocks Arizona USA © Andrea Izzotti/Shutterstock

13. Ha Long Bay, Vietnam

Just off the coast, near Hanoi, an estimated 1969 islands pepper the waters of Ha Long Bay – one of the most spectacular places in all of Vietnam. These limestone towers may not be unique, but nowhere else can they be seen on such an impressive scale. Arriving in a wooden junk, visitors can explore a clutch of gorgeous caves inside some of the structures, or swim amongst the glimmering phosphorescent plankton.

Halong Bay fishing village, Vietnam © Shutterstock

Halong Bay fishing village, Vietnam © Shutterstock

14. Nitmiluk Gorge, Australia

Carved into the Arnhem Land plateau by the Katherine River, this 12km-long gorge is the centrepiece of the Nitmiluk National Park. Surrounded by sheer ochre cliffs, with a scattering of waterfalls and walking trails, river cruising – or for the more adventurous, kayaking – is a magnificent way to see this gaping hole in the Katherine countryside.


Nitmiluk (Katherine) Gorge at sunset, Nitmiluk National Park, Australia © lrosebrugh/Shutterstock

15. Brighstone Bay, Isle of Wight, England

One of Europe’s best spots for finding dinosaur bones, Brighstone Bay is a great place to embrace your inner Indiana Jones and join a fossil-hunting tour. As the sea eats away at this section of coast new specimens are continually coming to light and you could find yourself getting up close and personal with all manner of giant beasties, including 5m-tall Iguanodons.


© Laurence Baker/Shutterstock

16. Sperrgebiet National Park, Namibia

Namibia’s newest national park, Sperrgebiet has long been out of bounds to visitors and is still tricky to access. One of the world’s top biodiversity hotspots, this semi-desert region is most famous for its epic sand dunes, which are covered in alluvial diamonds; in the nineteenth century they were collected under a full moon so that it was easier to see them sparkling.


© MindStorm/Shutterstock

17. Pulpit Rock, Norway

Soaring a stomach-churning 600m into the air, Pulpit Rock and the surrounding fjords were all gouged into the Norwegian landscape by glaciation during the last Ice Age. The rock’s smooth top was planed away by ice and the deep cracks in its sturdy granite are also the result of pressure release from melting glaciers. One day it will cleave away from the mountain completely, but hopefully not before you can pose for a photo.

Ready to explore Norway? Start preparing by finding out how to get there.


Pulpit Rock, Norway © Landscape Nature Photo/Shutterstock

18. Gold Reef City, Johannesburg, South Africa

Don your hard hat and grab a torch for the unique opportunity to explore a historic underground mine on a tour of the world’s richest gold reef. Once you’ve risen from the murky depths of the 226m mine shaft you can see what motivated prospectors and miners for yourself, with a live molten pour of the shiny stuff.

Gold mine shaft ©  Vic Clark/Shutterstock

Gold mine shaft © Vic Clark/Shutterstock

19. Giant crystal caves, Mexico

Made all the more special by the fact that they are so difficult to reach, Mexico’s giant crystal caves were originally discovered accidentally by silver miners. Extreme conditions of around sixty degrees centigrade and up to one-hundred percent humidity have allowed the crystals to grow up to 12m long, creating a psychedelic landscape that wouldn’t look out of place in a sci-fi film.

Crystals © Sebastian Janicki/Shutterstock

Crystals © Sebastian Janicki/Shutterstock

Meteor Crater, Arizona, USA

The world’s best-preserved meteor impact site, Arizona’s Meteor Crater is irrefutable evidence that objects from outer space can, and do, collide with the earth. Thought to have landed at a speed of around 40,000 miles per hour, this particular meteorite made a dent almost a mile wide and over 170m deep; the hollow was even used as an official training site for the Apollo astronauts.


Meteor crater in Arizona © Grindstone Media Group/Shutterstock

Rough Guides Editors

written by
Rough Guides Editors

updated 07.06.2024

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