The Roe River in Montana, USA, is officially recognized by the Guinness World Records as the shortest river in the world. It flows for only 201 feet (61 meters) from Giant Springs to the Missouri River. For years, the record was held by the D River in Oregon (440 feet), but a successful campaign by school students in Montana proved that the Roe River was even shorter. This fact highlights the difficulty in defining what exactly constitutes a 'river' versus a 'stream' or a 'spring.' In Montana's case, the Roe is a significant water source despite its tiny length, and it remains a point of local pride and a fun piece of geographical trivia.