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Hi! Szia! It's a wonderful spotting of Natrix natrix indeed ! It would be really great if you also added it to the 'Reptiles and Amphibians of Central Europe' Mission: http://www.projectnoah.org/missions/1329...
Hi arskan77, and welcome to Project Noah! You're right with Natrix natrix. More specifically, that pattern is that of n.n.natrix, the morph found in north and eastern Europe.