A River Runs Through It was filmed in Montana in the United States of America.
Gallatin River
In movie
Scene where Paul and Norman are fishing.
Real
Scene was shot The Gallatin River is a tributary of the Missouri River, approximately 120 mi (193 km long), in the U.S. states of Wyoming and Montana. It is one of three rivers, along with the Jefferson and Madison, that converge near Three Forks, Montana, to form the Missouri. It originates in the northwest corner of Yellowstone National Park.