The Royal Astronomical Society of Canada has officially designated Jasper National Park as a Dark Sky Preserve. At 11,228km2, Jasper is the largest Dark Sky Preserve in the world, and the only preserve in Canada with a town wholly within the preserve. Most of Jasper National Park has excellent dark skies; the southern part of the park boasts truly dark skies. This is one of the only areas in southwestern Canada with exceptional darkness, yet is accessible by year-round road and offers multiple accommodation facilities.
Read the article in Canadian Geographic describing the process to create the Preserve, and the article in the local Fitzhugh newspaper describing what it means for the park and the community.
Source: http://jasperdarksky.org