Jasper National Park, established in 1907, is the largest national park in the Canadian Rockies. At 11,228 square kilometres, Jasper National Park's dark-sky preserve is larger than the combined total of the rest of the world's dark-sky preserves.
A dark-sky preserve is an area that is kept free of artificial light. The purpose of a dark-sky preserve is to promote astronomy and the reduction of light pollution. Canada is just about the only country with established and extensive standards for dark-sky preserves based on the work of the Royal Astronomical Society of Canada.
They hold a Dark Sky Festival every year as well, visit JasperDarkSkyFest.com for more information about events!
Source: jasper.travel, Parks Canada, jaspernationalpark.com, Wikipedia