Leven Bank

Leven Bank is one of Tanzania's most legendary advanced dive sites, a massive submerged bank rising from the deep Pemba Channel to within accessible range of the surface, creating an isolated underwater plateau that concentrates marine life in densities that rank among the most impressive anywhere in the western Indian Ocean. The bank's remote position in the open channel between the Tanzanian mainland and the offshore islands makes it an expedition-style dive that rewards the effort of reaching it with encounters that divers describe as career-defining. The Pemba Channel, through which Leven Bank rises, is one of the Indian Ocean's most productive marine environments, with deep oceanic water upwelling along the channel walls to bring nutrients from below into the sunlit surface zone. This upwelling creates the extraordinary biological productivity that makes the Pemba Channel famous among marine biologists and serious divers alike, and Leven Bank stands at the epicenter of this productivity, its shallow summit and surrounding walls concentrating the marine life that the channel's rich water supports. Descending to the bank's upper sections reveals a plateau covered in the most vigorous coral growth imaginable, with hard corals competing intensely for the limited space on the bank's summit and slopes. The coral diversity reflects the western Indian Ocean's remarkable reef fish fauna, and the fish populations around Leven Bank are simply astonishing in their density and variety. Schools of fish containing hundreds or thousands of individuals swarm the bank's structure, their aggregations visible from distance as dark clouds in the clear blue water. The feeding activity around the bank is constant and intense, as the current continuously delivers the planktonic food that sustains this marine abundance. The fifty-meter depth at Leven Bank provides access to the wall sections where the channel's deepest ecological communities are found. Gorgonian sea fans of impressive size spread across the current-swept faces, while the overhangs harbor large grouper and the other apex predators that define a healthy reef ecosystem. Pelagic encounters at Leven Bank are exceptional even by Indian Ocean standards, with large schools of yellowfin tuna, manta rays visiting the bank for cleaning, and the possibility of whale shark encounters making each dive a potential meeting with the ocean's most magnificent inhabitants. The advanced rating of Leven Bank is fully warranted by the combination of remote location, strong channel current, and depth that characterize this world-class site. Only experienced divers with proper training and professional local operators should attempt this dive, but for those who do, Leven Bank delivers an encounter with the Indian Ocean's grandeur that few sites anywhere on earth can equal.