Other threats remain, including bycatch and pollution. One of the peculiarities of the Black Sea is that it is technically dead below a depth of about 180m (590ft): no oxygen gets through to its depths. Marine life is concentrated in the upper stratum. "Having in mind that 87% of the sea water is naturally anoxic, the Black Sea is highly sensitive to anthropogenic impacts due to the huge catchment area and almost landlocked nature," according to the UN Environment Programme.
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