Seriously? Although both the book and movie are set in Missoula and on the Blackfoot River, it was filmed in late in south central Montana in Livingston and Bozeman, and on the nearby upper Yellowstone, Gallatin, and Boulder Rivers.
Catholics have the Vatican, Muslims have Mecca. But to the fly-fishing faithful, there is no more sacred destination than the Big Blackfoot River in Montana.
LINK (via: The NY Times)