There is a so called "Thracian Bosporus" which is the one at Byzantion and the "Cimmerian Bosporus" which is the Strait of Kertch.
There is a so called "Thracian Bosporus" which is the one at Byzantion and the "Cimmerian Bosporus" which is the Strait of Kertch.
My first balloon:
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