Madeira looks like a green garden dropped in the Atlantic, but underneath it is raw volcano. Once you know how the island was built, the cliffs, caves and hidden coves along the south coast stop being scenery and start telling a story.
How was Madeira formed?
Madeira is the exposed summit of a huge volcano that grew up from the Atlantic seabed through repeated eruptions over millions of years. Most of the mountain is underwater: the island you walk on is only the tip, with the seafloor falling away thousands of metres below the waves.
Lava flows, ash layers and cinder cones piled up, one on top of the other. The oldest rocks visible on the main island are generally dated at around five million years, while neighbouring Porto Santo is older still. Madeira is part of a volcanic archipelago that also includes the Desertas and Selvagens islands.
Is Madeira still an active volcano?
No. Madeira is volcanic in origin but is not erupting today, and the island is considered quiet. The most recent eruptions are thought to date back thousands of years, and what you see now is mostly the work of erosion rather than fire.
Why are Madeira's cliffs so tall and steep?
The island rose quickly from deep water, then rain and ocean waves cut into it for millions of years. The result is a rugged mountain spine, with Pico Ruivo at 1,862 metres, plunging into the sea along the coast.
The most famous example is Cabo Girão, a basalt wall of about 580 metres and one of the highest sea cliffs in Europe. From a boat you can read it like a book: dark layers of lava flows, reddish bands of baked ash and thin vertical stripes where molten rock once forced its way upwards. Those stripes are called dykes, and they are far easier to spot from the water than from the skywalk above.
What are sea caves and sea arches made of?
They are carved by waves attacking weak spots in the volcanic rock. Softer ash layers and cracked lava erode faster than hard basalt, so the sea hollows out caves, notches and small arches along the base of the cliffs. The same process keeps going every winter, which is why the coast keeps changing slowly. If you want the practical side, our guide to the sea caves of Madeira explains where they are and when the sea allows a closer look.
What is a fajã, and why does Madeira have them?
A fajã is a small flat platform at the foot of a sea cliff, formed by landslides or old lava flows pushing out into the sea. Because the land is otherwise so steep, these little shelves became precious farmland for generations, with their own microclimate and fertile soil.
Fajã dos Padres is the best known on the south coast. It sits under the cliffs west of Câmara de Lobos and is easiest to reach by boat, which is why it is a highlight of our Day Trip. You can read more in our Fajã dos Padres guide.
Why does Madeira have so few sandy beaches?
Hard volcanic rock dropping steeply into deep water leaves little room for sand to settle. Most of the island's swimming spots are pebble or boulder beaches, lava pools and rocky coves rather than long golden stretches. The sand that does exist is often dark, which we cover in why Madeira has black sand.
The upside is the water itself. With the seabed dropping away quickly, the sea beside the cliffs is deep and very clear, which is exactly what makes swimming from a boat so good here.
How can you see Madeira's volcanic geology up close?
The best way is from the sea, because the cliffs, dykes and caves show their full height only from below. On a private boat trip with Chifbay, the Day Trip leaves Funchal at 10:00 or 14:00 and runs along the coast to Câmara de Lobos, Cabo Girão and Fajã dos Padres, with a swim stop and the option to continue to Ponta do Sol on the 3h version. The Sunset Trip covers the same coastline as the light turns the basalt orange.
The boat is yours alone, so you can ask the skipper to hold position under a section of cliff and take your time. Every trip includes drone footage from above (weather allowing), an Insta360 360° video and high quality photos, so the scale of the coast is captured properly.
You can climb the island, but only from the sea do you see how it was built.
Frequently asked questions
Is Madeira an active volcano? No, the island is volcanic in origin and quiet today.
Is Cabo Girão the highest cliff in Madeira? It is the best known at about 580 metres and one of the highest sea cliffs in Europe; other cliffs on the island are also very tall.
Do I need to know geology to enjoy it? Not at all. Look for the stripes, layers and caves, and your skipper will point out the best ones.