Sproat Lake, named after entrepreneur and colonial official Gilbert Malcolm Sproat, is a lake in central Vancouver Island. Roughly cross-shaped with four arms, it is over 25 kilometres in length, but has 300 kilometres of shoreline. Home of the last Martin Mars type waterbombers, and near Port Alberni, Sproat Lake is a popular summer recreational area for the Alberni Valley. Highway 4 runs along its scenic north shore.