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The NW part of the Black Sea is under the strong influence of the Danube River that discharges into the basin. Danube, through the input of sediment and water, has a double function in controlling the gas presence in NW Black Sea shallow sediments. The first function is to deliver into the sea the terrestrial organic matter that it is added to the marine in origin one. The second function is to provide a sustained sedimentation rate, needed to bury older organic matter, conducting to biogenic generation of methane...