Last Mountain Lake, Natural prairie lake in Saskatchewan, Canada

Last Mountain Lake is a large natural water body stretching across the prairie landscape of southern Saskatchewan. The lake is bordered by several communities including Regina Beach and Saskatchewan Beach, where visitors can reach the shoreline and explore the surrounding area.

A trading post operated by the Hudson's Bay Company stood near the lake from 1869 to 1871 and played a role in the region's early commerce. The post was destroyed by fire, marking the end of that commercial operation.

The lake holds significance in Plains Cree tradition, where the name reflects beliefs about spiritual forces shaping the landscape. Local stories passed down through generations connect the waters to cultural practices and the relationship between people and the land.

Visitors can access the lake from several locations including Regina Beach, Saskatchewan Beach, and Glen Harbour, each offering different starting points for exploration. The warmer months are the best time to visit when shore access and outdoor activities are most convenient.

The lake is a Ramsar wetland site, and at its southern end the Valeport Marsh forms part of the Valeport Marsh (SK 061) Important Bird Area of Canada, managed with Ducks Unlimited. The adjoining Big Valley property, held by the Nature Conservancy of Canada, is protected as bird and wildlife habitat.