Point Pelee's Lake is located in Ontario, Canada and is the southernmost point of mainland Canada. It is part of the Point Pelee National Park and is named after the nearby Point Pelee peninsula. The lake is fed by the Detroit River and is part of the Great Lakes system. Its name is derived from the French word 'pelee', meaning bald. The lake is also known as Lake Erie, which is the four letter answer to the crossword puzzle.