I have to post this article because it's fascinating, hilarious, and terrifying all at once. Interestingly, the comments on it seem to agree with my instinct: the Strid, the innocent-looking creek in the UK that drowns everyone who touches it, is the scariest. That's precisely because it is so innocent-looking. It's also because, jeez, English landscapes aren't supposed to be deadly! Every other continent, sure--no one's surprised to find Africa featuring twice on this list--but England? Where a gentle 1,000-foot-tall hill is a mighty mountain, and serious weather means a foot of snow? Regardless, it houses The Stream That Will Suck You Under To Unknown Depths and Drown You and They Will Never Find Your Body.
Mind you, I did LOL later in the article when they refer back to "jumping the Pleasant Brook of Death." There is comedy gold throughout here. Dark-comedy gold.