These Kananaskis river surfers ride high-risk waves, even in 28 C

River surfers come from far and wide, and form tight friendships as they look out for each other on these dangerous waters.

The Mountain Wave, located on theKananaskisRiver,was created from a flat river sectionin 2014 by the organizationSurf Anywhere for the Alberta River Surfing Association.

It took about a decade to get the permission and the time needed to build this wave on public land less than anhour west of Calgary a process that involved placing boulders inthe river to form a channel.

Now, it's a permanent wave that surfers canride for free, with the added benefit of ending up in roughly the same spot that you start.

Andeven in the extreme cold of Alberta's unpredictable weather, river surfers are out there taking advantage of it.

The following photos and video were taken by Christina Ryan, who spent some time getting to know thesurfers and what attracts them to the sport.