You are looking out over Lake Simcoe, part of the Trent-Servern Waterway of Ontario. It is mainly used in the summer by boaters who wish to explore many of the natural beauties of this province.
Visible to the left is land known as Georgina Island, home of the Chippewas, part of the First Nation group of he Ojibaway. Ferry service connects it in the summer. In winter there is usually a time of solid ice. That's when cars may move about on the lake. But not yet this winter!