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Sorry for a quite bad picture. I was afraid to get closer!
Seen in Croatia, inlands, not near sea. As he is on the picture there with the legs stretched out, I'd say he was about 8-10 cm in length.
It is a female, the males of this genus are quite distinct. The genus is Argiope, and the specific epithet most probable is bruennichi. It is not a clinically important spider.