and have a rich biology. The remainder of the Sea is brackish, poor in oxygen, and in species. Thus, statistically, the more of the entrance that is included in its definition, the healthier the Baltic appears; conversely, the more narrowly it is defined, the more endangered its biology appears.

Etymology and nomenclature

The precise origin of the name is unknown. Tacitus called it the Suebic Sea, Latin: Mare Suebicum after the Germanic people of

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