Codanus sinus
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The Codanus sinus is the vague area described by Pomponius Mela, as a great bay located to the north of Germany, among whose many islands was one, "Codanovia," of pre-eminent size; this name reappears in Pliny the Elder's work as Scatinavia. Codanovia and Scatinavia were both Latin renderings of the Proto-Germanic *SkaĆ°inawio, the Germanic name for Scandinavia.
The name is probably a blend of an old form for Kattegat and Scandinavia.