The Codanus sinus is the Latin name of the Baltic Sea and Kattegat.
According to Pomponius Mela (3.31, 3.54) and Pliny the Elder (4.96), it is an "enormous bay" lying beyond the Elbe". It has "many small islands", the largest one being Scandinavia (the manuscripts of Mela have Codannovia).
The origin of the name is obscure.
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