The Roe River

The Roe River, which flows about 200 feet from Giant Springs to the Missouri River near Great Falls, was once recognized by Guinness World Records as the world's shortest river after a successful campaign by local schoolchildren. That record category has since been discontinued, but the Roe still informally competes with Oregon's D River for the title of shortest river, and both have been measured at different lengths on different occasions.

Giant Springs, the source of the Roe River, is one of the largest freshwater springs in the United States and is protected inside Giant Springs State Park.