Somewhere near Baffin Bay, in the frozen expanse of western Greenland’s ice sheets, are two connected rivers. It’s a never-before-explored area that polar adventurers Sarah McNair-Landry, Erik Boomer and Ben Stookesberry have dubbed “Twin Galaxies.” The trio are true explorers, hauling sleds of gear and kayaks across 600 miles of glaciers and crevasses to be the first to run an Arctic river that they’ve only glimpsed on Google Earth. The 46-day expedition combines kiteboarding, skiing, camping and kayaking and is fraught with injuries, disappointments and frigid weather. But their efforts are rewarded with stunning canyons of blue ice and the chance to paddle first descents of churning waterfalls that spit them out into the Arctic Ocean.