I must confess that I didn't know about this before… I've just come across a very beautiful video about Treviso—the town where I live—and its river Sile (among the longest resurgence rivers in Europe). Subtitled in English and narrated by Red Canzian, a popular Italian musician in a band named The Pooh, the video is titled “Sile, oasi d’acque e di sapori” (Sile, oasis of waters and tastes). Hope you'll enjoy it!
PS: Check out some of the following links to learn more about the river Sile: