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Trou aux biches · Mauritius · Indian Ocean

Max. depth · 40 m

Black Forest, Trou aux Biches: Glass Coral Plateau

Descend into a unique underwater landscape where thick stalks of glass coral form an ethereal forest, teeming with hidden marine life just before the deep drop-off.

What makes this site special

  • Dense forest of glass coral (Tubastrea micrantha)
  • Plateau dive leading to a deeper slope
  • Encounters with grouper (Mérou)
  • Vibrant angelfish (Poisson-ange) populations
  • Sightings of porcupinefish (Poisson-porc-épic)
  • Saber squirrelfish (Poisson-écureuil sabre) in crevices
  • Depths accessible from 25 to 40 metres

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Black Forest about the site

Diving Black Forest transports you to a realm unlike many coral reefs, emerging onto a shallow plateau at 25 metres that gradually slopes down to 40 metres. The initial descent reveals scattered coral heads, but as you approach the 30-metre mark, the 'forest' starts to materialise. The sheer density and structure of the Tubastrea micrantha corals here are what define the site, standing out distinctly from other reef formations in the area. This unique topography creates an intricate network of shadowed crevices and overhangs.

The heart of Black Forest lies in its namesake: a dense growth of glass corals (Tubastrea micrantha), their thick, dark trunks creating a mesmerising, almost otherworldly landscape. As you navigate through these coral structures, the light filters down, creating dappled patterns that enhance the forest-like feel. It's a dive that encourages slower movement, allowing you to absorb the detail and appreciate the intricate architecture formed by these fascinating invertebrates. The sheer scale of this coral growth is what makes the site so distinctive.

Within this dense coral canopy, various reef dwellers find refuge and hunting grounds. Keep a keen eye out for groupers (Mérou) lurking in the shadows, their powerful forms often camouflaged against the dark coral. Angelfish (Poisson-ange) with their vibrant colours dart gracefully between the branching structures, a startling contrast to the deeper hues of the habitat. The prickly forms of porcupinefish (Poisson-porc-épic) can be spotted, often tucked away, while saber squirrelfish (Poisson-écureuil sabre) add flashes of red and orange to the scene, particularly in the more shaded recesses. This concentration of life, interacting with such a specific coral type, is what truly defines the Black Forest experience.

Diving Black Forest: the marine life you’ll meet

Diving conditions

Black Forest is accessible to divers of all levels, offering a minimum depth of 25 metres and extending to a maximum of 40 metres. The best time to experience this site, aligning with general conditions for the north-west coast of Mauritius, is year-round. Given the regional patterns, be prepared for currents that are not solely tide-dependent and can be influenced by distant winds; the majority of dives in the area tend to be drift dives.

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Map of hotels, dive sites and dive centres in Trou aux biches

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