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The abyss geomorphic feature layer represents the spatial extent of the abyssal areas of the worlds oceans based on interpretation of the SRTM30 plus v7 global bathymetry model. The layer is one of the 25 layers that make up the global seafloor geomorphic features map (Harris et.al. 2014). The abyss is the area of seafloor located at depths below the foot of the continental slope and above the depth of the hadal zone (defined as deeper than 6,000 m). The abyss feature layer was created by clipping a layer representing the ocean with the shelf, slope and hadal layers.

The abyssal classificationgeomorphic feature layer represents the spatial extent of the abyssal areas of the worlds oceans based on interpretation of the SRTM30 plus v7 global bathymetry model. The layer is one of the 25 layers that make up the global seafloor geomorphic features map (Harris et.al. 2014). The abyss is the area of seafloor located at depths below the foot of the continental slope and above the depth of the hadal zone (defined as deeper than 6,000 m). The abyssal classificationfeature layer was created by clipping a layer representing the ocean with the shelf, slope and hadal layers. The resulting layer was then classification into areas of plains, hills and mountains based on variation in topography.

The Atlantis II Deep is in the central Red Sea. The deep attains a depth of over 2100 meters and is situated in the Red Sea rift, where the Arabian Peninsula and Africa are being split apart. Surveys in the 1960's confirmed the presence of hot, 60 °C, saline brines and associated metalliferous muds. The Atlantis II Deep has the biggest known metal-rich sea-floor deposit discovered to date, and it is by far the only example of a large-scale metalliferous-sediment type deposit. In the 1970s, a pre-pilot test mining study was conducted by a Saudi Arabian company (Preussag A. G.). Using what was described as “conventional floatation” means, they recovered 15,000 m3 of sea floor sediments and brines from four test sites in the Atlantis II basin. They also proceeded to concentrate the recovered material at sea. GRID-Arendal has been working on an environmental analysis of marine mineral deposits such as this as part of an assessment of Marine Minerals for the European Union.

The basin geomorphic feature layer represents the spatial extent of the basins of the worlds oceans based on interpretation of the SRTM30 plus v7 global bathymetry model. The layer is one of the 25 layers that make up the global seafloor geomorphic features map (Harris et.al. 2014). Basins are “a depression, in the sea floor, more or less equidimensional in plan and of variable extent”(IHO, 2008). In this study basins are restricted to seafloor depressions that are defined by closed bathymetric contours. Basins were mapped based on the identification of the most shoal, closed, bathymetric contours, examined regionally for the major ocean basins and shelf seas.