Stave Lake is a hydroelectric reservoir in the Stave River system, located on the northern edge of the District of Mission, about 65 km (40 mi) east of Vancouver, British Columbia. The main arm of the lake is just over 20 km (12 mi) long, and there is a southwest arm, about 9.5 km (5.9 mi) long, ending at Stave Falls Dam near Stave Falls. The original lake occupied about a third of the space of the main arm.