Manicouagan Reservoir and Gulf of Saint Lawrence, Canada – April 21st, 201248.5N 69.4W
Appearing a a white circle near the top of this image is the Manicouagan Reservoir (also Lake Manicouagan and the “Eye of Quebec”). This annular lake in central Quebec, Canada covers an area of 1,942 km², surrounding René-Levasseur Island. Here, at the end of the northern hemisphere winter, the lake appears frozen.
Visible to the south is the Gulf of Saint Lawrence, the world’s largest estuary. It is the outlet of North America’s Great Lakes via the Saint Lawrence River into the Atlantic Ocean. It is a semi–enclosed sea, covering an area of about 236,000 km2 (91,000 sq mi) and containing 35,000 km3 (7.7×1015 imp gal) of water. Sediments can be observed near the mouth of the river, entering the gulf.