Cold Lake is a large lake in Northern Alberta and Saskatchewan, Canada. The lake straddles the Alberta/Saskatchewan border, and has a water area of 373 km² (144 sq mi). It is also one of the deepest lakes in Alberta with a maximum depth of 99.1 m (325 ft). It has around 24 known species of fish in it and is a major ice fishing lake. It is also major stop for many migrating birds, and is home to one of the largest warbler populations in Alberta.