Lake Ontario is the smallest of all the Great Lakes at an area of 18,960km2, but its water has its perks. It holds approximately four times the volume of water about 1640 km3 of the Erie, although it is similar in width and length. Most east of the Great Lakes, Lake Ontario is located at the foot of Niagara Falls. It is confined to Ontario, Canada to the southwest and north and New York to the south. The lake is about elliptical; Its main axis, 311 km long, lies almost from the east to the west, and its largest width is 85km. The total area of the lake basin is 64,025 km2, only from the lake surface is 19,011 km2. Lake Ontario has an average depth of 86m and the greatest depth is 244m. River St. Lawrence offers a lake outlet to the Atlantic Ocean. The lake has a series of lagoons and bay-mouth bars, which are made of sand, mud or other waste that closes the bay area. There are several islands on the lake, including a thousand islands of the region, an archipelago of nearly 2,000 islands that draw the US Canadian border. Many of the islands summed up the largest of them is Wolfe Island, which has 124km2.
Because of the depths of the lake and the warm weather coming from the southwest, Lake Ontario rarely freezes. The water temperature reaches a level of about 24 ° C in August at the lowest level of about 3 ° C in February. The industry is concentrated around the port cities of Toronto and Hamilton, and Rochester. Other important ports on the lake include Kingston and Oswego. The lake freezes only near the land, and its ports faded from mid-December to mid-April. Without a doubt, the Great Lakes and the River St. Lawrence had an important role in the North American trade long before achieving US and Canada independence.