English: The twin cities of Sault Ste Marie are located across the St. Mary’s River, which forms part of the international boundary between Canada (Province of Ontario) and the United States (State of Michigan). This astronaut photograph highlights the two cities, as well as the lakes and islands that separate Lakes Huron and Superior, two of the Great Lakes of North America. Smaller lakes include Lake George to the west, and the large forested islands of St. Joseph and Drummond are visible at image upper left. The Sault Ste Marie urban areas (image lower left) have a distinctive gray to white colour, contrasting with the deep green of forested areas in Ontario and the lighter green of agricultural fields in Michigan. The water surfaces in the lakes and rivers vary from blue to blue-green to silver, likely the result of varying degrees of sediment and sunglint—light reflecting from the water surface back to the International Space Station.