Tsingy: How Madagascar Grew a Forest of Stone

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By Jordan Lamont · Last updated 7 October 2026

There is a place in western Madagascar where the ground itself turns into a forest — not of trees, but of stone blades, thousands of grey limestone spires sharp enough to cut, packed into a maze you cannot cross on foot. The Malagasy named it with brutal honesty: tsingy, “where one cannot walk barefoot.” It looks like another planet, and the story of how it formed is as strange as the sight. (For how to actually visit, see our complete Tsingy de Bemaraha guide.)

A sea turned to stone

The tsingy began life underwater. More than 200 million years ago, in the Jurassic, thick layers of limestone were laid down as sediment under a shallow sea. Over vast stretches of time, tectonic uplift raised that ancient seabed high and dry above the ocean — a slab of fossilised ocean floor, waiting to be carved.

Carved by rain

The sculptor was water. Rainwater, made slightly acidic by carbon dioxide in the air, slowly dissolved the limestone along its cracks — a process called karstification. Over millions of years it ate downward and outward, opening deep crevices, underground rivers and caves, and leaving the rock between them standing as needle-sharp pinnacles, some rising around 100 metres. The result is a “forest of sharp stones”: grey cathedrals of rock stretching for kilometres in a dense, blade-edged labyrinth.

A refuge built of knives

What makes the tsingy more than a geological curiosity is what lives inside it. The maze of pinnacles, canyons and caves creates countless isolated micro-habitats, and a remarkable array of lemurs, reptiles and plants survives here — some found nowhere else — sheltered by terrain so hostile that neither predators nor people can easily move through it. The stone forest is, in effect, a fortress for wildlife.

Why it matters today

Tsingy de Bemaraha, a UNESCO World Heritage site since 1990, is one of the most extraordinary landscapes on Earth and a showcase of deep geological time. Plan the timing carefully — it is dry-season only — with our best-time guide, read the full Tsingy guide, and build the trip with our Madagascar travel guide.

FAQ

What does “tsingy” mean?

It is a Malagasy word meaning roughly “where one cannot walk barefoot” — a perfect description of the razor-sharp limestone pinnacles.

How did the tsingy form?

Limestone laid down under a shallow sea over 200 million years ago was uplifted, then dissolved by slightly acidic rainwater into deep crevices and needle-sharp peaks.

How tall are the pinnacles?

Some rise around 100 metres, forming vast stone “cathedrals” and an impenetrable maze that stretches for kilometres.

Can you visit?

Yes — Tsingy de Bemaraha is a UNESCO site with via-ferrata routes; see our full Tsingy guide for how to go.