Wollaston LakeWikipedia. Wollaston Lake is a lake in northeastern Saskatchewan, Canada is 550 kilometres (340 mi) northeast of Prince Albert.With a surface area of 2,286 square kilometres (883 sq mi) (excluding islands 2,681 square kilometres (1,035 sq mi) if islands are included), it is the largest bifurcation lake in the worldthat is, a lake that drains naturally in two directions.