This river flows in two directions at once, and scientists still can’t fully explain it

Rivers are a source of water for human beings and crops, they help generate electricity through dams built on them in their original flow, they flow downhill, merge with bigger ones, and head to the sea or a lake.But sometimes, Mother Nature throws a curveball, creating river channels that split and flow in two directions simultaneously!Sounds impossible right?But a river like that does exist in reality! Located in northern Manitoba's swampy flats, 70 km northeast of Lake Winnipeg's tip, the Echimamish River links the Hayes and Nelson Rivers over its 60-67 km length, flowing both ways from a central beaver-dammed pond, according to the NASA Earth Observatory.Its name translates to "water that flows both ways," creating a rare bifurcation where water diverges east to the Hayes and west to the Nelson, both draining to Hudson Bay 500 km northeast.Researchers call it “one of the most obscure, the most baffling, and the most unique to investigate,” due to subtle splits hard to pinpoint amid flat terrain and beaver dams, according to a Water Resources Research study by Rob Sowby of Brigham Young University.“The conditions have resulted in conflicting historical records, if not mythical musings, some of which are still not resolved,” the team wrote. Canoers often miss the current switch, which can also change kilometers with beaver activity. Sowby suggests the Echimamish is evolving, possibly capturing upper Hayes flow or fully splitting basins through stream capture. Flat swamps yield barely detectable currents, imaged by Landsat 9 on May 23, 2025, near Painted Stone Portage.For thousands of years, the Echimamish River has held profound significance for Indigenous communities, including archaeological sites and the sacred Painted Stone Portage along its banks.European fur traders depended on it as a important shortcut to the Hayes River and York Factory, the Hudson’s Bay Company's key trading post from the late 17th to the 20th century. Today, the Hayes, Echimamish, and a portion of the Nelson River are recognised as part of Canada's Heritage Rivers System.