Because the greeks beleved the vistula was at some point connected to the deniper and then to the black sea. And i think there is a point where crosing between the 2 of them is posible or at least easier than the crossing at suez. Its not clear because the logs are missing but pytheas probably circumnavegated europe by doing this in one of the expeditions.
It is also convinient because in classical times east of the vistula is ruled by iranians west of it by germans.
Because the greeks beleved the vistula was at some point connected to the deniper and then to the black sea. And i think there is a point where crosing between the 2 of them is posible or at least easier than the crossing at suez. Its not clear because the logs are missing but pytheas probably circumnavegated europe by doing this in one of the expeditions.
It is also convinient because in classical times east of the vistula is ruled by iranians west of it by germans.
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