Yes, its true! There is an actual lighthouse in Saskatchewan. It sits upon an isthmus between two lakes that was created by glaciers.
This lighthouse was built in 1989, initiated by the first mayor of Cochin, SK. It is a hexagonal tower and 11.5m high.
Be prepared for the hike up to this cache! Its 152 steps to the top. Its worth it for the view!
Map of Rosthern & Cochin: