The East Branch Rat Root River is a tributary stream located in Koochiching County in northern Minnesota, flowing through the pristine wilderness near the Canadian border. This scenic waterway serves as an important spawning route for walleye traveling upstream from Rainy Lake and has historically been a significant fishery, though the spawning runs have diminished over time compared to their historical peaks. The river system provides diverse aquatic habitat ranging from slow-moving sections to more rapid waters, creating varied fishing opportunities throughout its approximately 24-mile stretch. The river ultimately connects with Rat Root Lake before eventually flowing into Rainy Lake, making it part of the larger Rainy Lake watershed ecosystem.