Depends on how one defines the Netherlands of courseafter all, Aruba is a constituent country of the Kingdom of the Netherlands and that certainly has venomous snakes!
As for personal experiences, I've come across European Adder on numerous occasions when hiking in the Scottish Highlands, Northumberland and Lake District.... and also, on a few occasions, in the garden of Helly's parents who live out in the Northumberland moorlands.
It is thanks to the latter that I took these photographs:
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Nice photos!