Here, from Facebook, is a list of the world’s most venomous snakes, as measured by the LD50 (the amount of venom it take to kill 50% of a given prey type, expressed as milligrams of venom per kilogram of prey). Note that the top 11 are all from Australia, as are 21 of the top 25.
Now why are there so many venomous snakes in Australia? (I think the same holds for venomous spiders.) I can think of two or three reasons, and I’m sure it’s been discussed in the literature, but it’s Saturday and I’ll leave this for readers to think about or look up.
But I do want to mention the #1 most venomous snake: the Inland taipan. How venomous is it? Ask Wikipedia (my emphasis):
Based on the median lethal dose value in mice, its venom, drop for drop, is by far the most toxic of any snake – much more…
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Utopia, you are standing in it! 
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