Old Wives Lake is a large, shallow saline lake located in southern Saskatchewan, Canada, situated in the semi-arid prairie landscape southwest of Moose Jaw. The lake sits within a broad, flat watershed shaped by glacial history, and its character is defined by the surrounding agricultural plains and the unique ecological conditions of the mixed grassland and aspen parkland ecodistricts. The lake is well known as a significant migratory bird staging area, particularly for shorebirds and waterfowl, and the broader watershed supports a range of aquatic and riparian habitats. The riparian zones along the lake and its tributary watercourses play an important role in trapping sediment, filtering agricultural runoff, stabilizing banks, and providing wildlife habitat — functions that directly influence water quality and the overall health of the aquatic ecosystem.