Wood Buffalo National Park is Canada's largest national park at 44,807 square kilometres, straddling the border of the Northwest Territories and Alberta. It’s smaller than the U.S.’s largest park, Wrangell-St. Elias National Park and Preserve, but bigger than Switzerland. The park is the world’s largest Dark Sky Preserve and it has a beaver dam so large it’s visible from space.

Retreat of the tidewater rivers of ice at Glacier Bay National and Preserve is a clear and easily viewed sign of climate change. Not as visually apparent is what is transpiring beneath the shimmering surface bay waters in this 3.3-million-acre swath of mountain and marine wilderness.

An Alaska man hunting in Wrangell-St. Elias National Park and Preserve apparently drowned when trying to cross a river, according to the National Park Service.

Two rescue attempts were under way Monday at Wrangell-St. Elias National Park and Preserve, where climbing rangers were trying to reach three mountaineers in trouble on Mount Bona while other rangers were trying to reach a downed plane near Mount Hawkins.