Trou de Fer
Réunion
Trou de Fer, meaning "Iron Hole," is a breathtaking canyon located on Réunion Island in the Indian Ocean. This natural feature is carved by the Bras de Caverne River, a tributary of the Rivière du Mât, and reaches depths of up to 300 meters. The canyon is distinguished by its two main parts: a vast crater fed by at least six prominent waterfalls, including a 200-meter high waterfall and a remarkable 300-meter undercut cliff waterfall, and a narrow slot canyon known as "The Corridor" or "The Narrows." The slot canyon extends approximately 3 kilometers and is often dammed by debris to form lakes such as the "Lake of the Eel." The cascading waters and mist create a unique spectacle, notably the "Washing Machine" waterfall, famous for its enveloping mist. The surrounding volcanic rock walls are porous, allowing numerous springs to feed countless smaller waterfalls, adding to the area's rich biodiversity and dramatic scenery. Due to its inaccessibility, it has been explored only since the late 20th century, with the first successful descent in 1990. Today, Trou de Fer is a must-see natural wonder, often admired via helicopter tours or from hiking viewpoints, offering visitors a glimpse into one of the most impressive geological formations in the French overseas territories.
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Tip: The best time to visit Trou de Fer is during the dry season to avoid heavy rain and poor visibility caused by mist and clouds. Booking helicopter tours in advance is recommended for a unique aerial perspective. For those opting to hike, prepare for a several-hour trek through forest trails to reach viewpoints, and bring waterproof gear due to frequent mist. Visitors should check local weather conditions and consider guided tours for safety. Discounts may be available for group bookings or with local tourism cards.
Interesting facts
- •Trou de Fer features one of the highest waterfalls in France, with a total drop of 725 meters.
- •The canyon has at least six distinct waterfalls feeding into it, creating a spectacular series of cascades.
- •The "Washing Machine" waterfall is named for the intense mist it generates, soaking visitors near its base.
- •The slot canyon known as "The Corridor" is about 3 kilometers long and can form lakes due to debris jams.
- •The first successful canyon descent was achieved in 1990 after an earlier failed attempt in 1989.
History
Trou de Fer's geological formation is tied to the volcanic activity of Réunion Island, creating a deep canyon up to 300 meters in depth.
The first recorded exploration attempts occurred in the late 1980s, with the initial descent in 1989 ending unsuccessfully due to heavy rains.
The first successful exploration was completed in October 1990 by a team including Pascal Colas and others, marking a significant milestone in understanding this remote natural site.
Since then, Trou de Fer has become a popular attraction, especially for aerial sightseeing and adventurous hiking, while remaining largely inaccessible by foot.
Place Guide
The Crater and Main Waterfalls
This large crater is fed by six major waterfalls, including the Bras de Caverne waterfall with a 200-meter drop, and a dramatic 300-meter undercut cliff waterfall. The area is notable for its powerful cascades and the unique geological formations around the falls.
The Slot Canyon (The Corridor)
Extending about 3 kilometers, this narrow slot canyon features multiple waterfalls and springs flowing through porous volcanic rock. It is sometimes dammed by debris to form temporary lakes, such as the "Lake of the Eel." The "Washing Machine" waterfall here is famous for its mist.
Viewpoints and Hiking Trails
Accessible by a several-hour hike through forest trails, viewpoints offer scenic overlooks of the canyon. However, visibility can be limited by mist, especially in the morning. Helicopter tours are a popular alternative to explore the canyon's grandeur from above.
