Is Georgian Bay a "bay" or a "lake"?

From Wikipedia.
A bay is an area of water mostly surrounded or otherwise demarcated by land. Bays generally have calmer waters than the surrounding sea, due to the surrounding land blocking some waves and often reducing winds. It can also be an inlet in a lake or pond. A large bay may be called a gulf, a sea, a sound, or a bight. A narrow bay may also be called a fjord if its sides are relatively steep. A cove is a circular or oval coastal inlet with a narrow entrance; some coves may be referred to as bays. Most small bays are formed as soft rock or clay is eroded by waves. Any hard rock is eroded less quickly, leaving headlands. Any bay may contain fish and other sea creatures or be adjacent to other bays (for example, James Bay is adjacent to Hudson Bay). Large bays, such as the Bay of Bengal and the Hudson Bay, have varied marine geology. There are various ways that bays can be created. For example, the water level of a sea can rise, flooding the shore and creating a bay.

From Wikipedia.
A lake (Old English lacu) is a terrain feature (or physical feature), a body of liquid on the surface of a world that is localized to the bottom of basin (another type of landform or terrain feature; that is, it is not global). Another definition is a body of fresh or salt water of considerable size that is surrounded by land. On Earth a body of water is considered a lake when it is inland, not part of the ocean, is larger and deeper than a pond.

Natural lakes on Earth are generally found in mountainous areas, rift zones, and areas with ongoing or recent glaciation. Other lakes are found in endorheic basins or along the courses of mature rivers. In some parts of the world there are many lakes because of chaotic drainage patterns left over from the last Ice Age. All lakes are temporary over geologic time scales, as they will slowly fill in with sediments or spill out of the basin containing them.

Well for my two cents worth, its a lake, its a bay in name only.