Swimming up the sweeping, curved path of the Yukon River, salmon undertake a 2,000-mile journey home to spawning streams across Alaska and Canada and ultimately passing through the Yukon capital of Whitehorse. Here, in a place joined by the river but separated by political boundaries, a group of monitoring experts met last month to better integrate our understanding of the region, but only after passing the invisible, plumb-straight line separating Alaska from Canada. More than 30 experts in areas of wildfire, vegetation, permafrost, contaminants, and invasive species are trying to figure out how to collect research and monitoring data that can be used across the vast forests, mountains, and glaciers of the boreal forest in Alaska and Canada, regardless of the jurisdictional boundaries.