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Trou de Fer canyon and waterfalls

View from above. The tallest - 300 m step of Bras de Caverne in the upper middle part, 270 m tall fall of Bras Mazerin in lower left corner
View from above. The tallest – 300 m step of Bras de Caverne in the upper middle part, 270 m tall fall of Bras Mazerin in the lower left corner. "Washing Machine" is the sharp corner of the canyon in the central – right side of image / jennifer_greatoutdoors, / CC BY-SA 2.0

WorldBlue  In short

Trou de Fer is one of most magnificent canyons in the world. This canyon is adorned with countless waterfalls, including the 725 m tall falls of Bras de Caverne stream.

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GPS coordinates
21.0378 S 55.5543 E (the tallest step of Bras de Caverne)
Location, address
Africa, Réunion, Saint Benoît, Cirque de Salazie, enormous canyon to the north-east from Hell-Bourg
Canyons and ravines, Waterfalls, Rock formations
Height of falls
725 m (Bras de Caverne Falls), tallest drop – 300 m

Map of the site

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WorldYellow In detail

It is hard to describe and photograph this amazing, seemingly improbable place.

Giant ravine

Trou de Fer could be translated as "Iron Hole" but this most likely is not the original name of canyon, initially it most likely was Trou d’Enfer – "Hell Hole".

This giant and complex ravine has formed in the comparatively soft volcanic rock, formed by Piton des Neiges – the tallest volcano in the Indian ocean.

Canyon starts at the height of some 1,400 m in the exotic Bélouve forest – a unique montane forest with numerous endemic species and ends after some 7.5 km when Bras de Caverne River joins Rivière du Mât some 240 m above the sea level.

Bras de Caverne disappears in an impossibly deep canyon, Réunion
Bras de Caverne disappears in impossibly deep canyon / Sebastien Delcoigne, / CC BY-SA 2.0


Canyon starts with the falls of the small Bras Mazerine stream (which often is dry). This stream with several falls disappears into a very deep cirque, a small pool named Bassin Fenoir. Several smaller trickles join from other sides of the cirque. Some springs appear from the porous volcanic rock in this cirque.

The larger and better-known waterfall of Bras de Caverne river joins the canyon from the left side after some 1.4 – 1.8 km. The waterfall of Bras de Caverne (River of the Cave) has three major steps. The first is 210 m tall, and it often is dry. After some 550 m comes the next major step – approximately 180 m tall.

Some 300 m further comes the tallest – 300 m tall fall. This is a magnificent, free leap deep into a narrow chasm, in a pool named Bassin des Grands Vents. Only closer to the bottom part water hits the cliffs.

In this part of Trou de Fer meet some six waterfalls – also Bras Mazerine makes here some 270 m tall fall.

This narrow cirque is filled with almost unbearable noise – the diverse pitch and rhythm of falls create deafening resonance.

Now all waterfalls and springs have formed a sizeable stream (which after the frequent rains becomes REALLY large) and it disappears into an incredible slot canyon through "Washing Machine" – a place where the fierce stream turns some 90 degrees, rising eternal mist.

Other falls in Trou de Fer, Réunion
Other falls in Trou de Fer / Bbb, / CC BY-SA 3.0

The Corridor

Now starts a dramatic landscape of another character. Bras de Caverne stream here flows through an incredibly deep slot canyon – the 3.2 km long "Corridor".

Stream here is just a few metres wide but the walls of canyon rise up to 850 m tall. Walls are covered with tropical plants but nevertheless rather frequent are rockfalls. After the frequent rains, the bottom of the canyon turns into a violent stream where no one can survive. Rockfalls form small, eerie lakes, including the Lake of Eels – a truly otherworldy place.

Exploration and tourism

This canyon was first climbed/walked by Pascale Lapoule, Laurent Broisin, and Pascal Colas on September 19-21, 1989.

Now in the beautiful Bélouve forest have been built nature trails which provide fine views of the canyon (but it is not possible to see the bottom). Very often here come helicopters – tourists gladly pay large sums to see Trou de Fer from above.

Few dare to climb the canyon. Unfortunately, rather many calamities have happened here – a volcanic rock is slippery and crumbling, and flash floods – sudden and merciless. Nevertheless, the climbing route is gradually improving, opening the possibility to experience this amazing place.


  1. Pascal Colas, Consultant, Trainer, Mountain Guide. Reunion canyons.

WorldYellow Linked articles

Landscape in Cirque Mafate, Réunion
Landscape in Cirque Mafate, Réunion / Simon Bonaventure, / CC BY-SA 2.0

Wonders of Réunion

In spite of its small size, Réunion offers rather diverse landmarks. The most impressive landmarks in Réunion are the numerous supertall waterfalls in forest-covered, incredibly deep canyons and ravines.

Virginia Falls, Canada
Virginia Falls / Paul Gierszewski, Wikimedia Commons / public domain


Some of the most fascinating and awe-inspiring natural monuments are waterfalls or locations where a river abruptly changes its elevation.

The Wave, Arizona
The Wave / Greg Mote, / CC BY 2.0

Rock formations

This diverse and extremely interesting category of natural landmarks includes such landmarks as natural arches, balancing rocks, ravines, rock spires, and others. Many natural stone “sculptures” seem to defy gravity and other natural laws – but they exist!

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