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Seismic reflection data document for the first time the existence of a BSR in a limited area west of the Dnieper Canyon in the northwestern Black Sea. Seismic wide-angle data suggest that gas hydrates occupy in average 152% of the pore space in a zone of 100m in thickness. A conservative quantification of the amount of methane associated with this gas hydrate occurrence is about 1231011m3 (0.60.2Gt...