Athabasca River

Federal documents echo earlier concerns that Canada's largest national park faces long-term threats that could place it on a list of endangered world heritage sites.

An infectious disease fatal to some kinds of young fish has been found in the North Saskatchewan River watershed.

Nearly 50 years after the opening of Canada's first major oilsands mine, the site is an epicentre of energy, teeming with bustling workers amid signs of its pioneering past and cutting-edge future.