The Great Divide Trail closely follows the Great Divide between Alberta and British Columbia …
… southern terminus is in Waterton Lakes National Park at the Canada–US border (where it connects with the Continental Divide Trail) and its northern terminus is at Kakwa Lake in Kakwa Provincial Park, north of Jasper National Park.
The trail is 1,130 km (700 mi) long …
… only portions of it are officially recognized by Parks Canada and therefore is often not signed and occasionally not even an actual trail – merely a wilderness route.
At present, the Great Divide Trail is about 80% singletrack, 10% wilderness route and 10% old roads and ATV trails.

More maps.
Ratatrail says the section starting at the American border is toughest — and the most rewarding.
Watch his unique video on YouTube.
official website – greatdividetrail.com