"The world’s most northerly sand dunes are in Athabasca Provincial Park in northwest Saskatchewan. They are 30 metres high. The Sand Hills of Saskatchewan near Moose Jaw are also a sight to see." (McAdam, 2012)

 "The Great Sandhills of southwestern Saskatchewan are a unique 1,900 sq. km area of active desert-like sand dunes. Native grasses and small clumps of trees such as aspen, willow and sagebrush flank the dune formations." (Tourism Saskatchewan Canada, n.d.)

References: 

McAdam, L. (2012, June). 145 Weird, Fun and Interesting Facts About Canada. Retrieved from Hike Bike Travel: https://hikebiketravel.com/145-weird-fun-interesting-facts-canada/

Tourism Saskatchewan Canada. (n.d.). Great Sand Hills. Retrieved from Tourism Saskatchewan Canada: https://www.tourismsaskatchewan.com/listings/735/great-sand-hills#:~:text=The%20Great%20Sandhills%20of%20southwestern,sagebrush%20flank%20the%20dune%20formations.