Chicago (English: Chicago) is located in the midwest of the United States, belonging to Illinois, with a population of about 2.9 million. Chicago and its suburbs make up the Greater Chicago area, with a population of over 9 million, which is the third largest metropolitan area in the United States after new york City and Los Angeles. Located in the center of the North American continent, Chicago is the most important railway and aviation hub in the United States. Chicago is also one of the major financial, cultural, manufacturing, futures and commodity trading centers in the United States. Since the establishment of 1833, it has gradually become one of the most influential metropolises in the world after more than one hundred years of development. Common nicknames of Chicago are "Second City", "Windy City" and "Chicago City".

The topographic satellite image of Chicago is located in the northeast corner of Illinois, near the southwest end of Lake Michigan, with the geographic coordinates of 4153' 0 "n87 39' 0" w/41.8333 n87.65w/41.8333; -87.65。 Chicago lies on the dividing line between the Mississippi River system and the Great Lakes system. There are two rivers in the territory, the Chicago River runs through the city center and the Kalume River runs through the industrial zone in the south of the city. Both rivers used to flow into Lake Michigan. At the beginning of the 20th century, in order to prevent the urban sewage from polluting Lake Michigan, the direction of the Chicago River was reversed, and it flowed southward into the Mississippi River system through the canal. According to the data of the US Bureau of Investigation, the total area of Chicago is 606. 1 km? 0? 5, of which 588.3 km? 0? 5 is land, 17.8 km? 0? 5 is the water surface. The water surface accounts for about 2.94% of the total area. The terrain near Chicago is quite flat, with an average elevation of 176 m, the lowest elevation is lakeshore 176 m, and the highest elevation is 224 m (4139'18 "n 87 34' 44" w/41. -87.57889)。

Detroit is the largest city in Michigan and the county seat of wayne county. Founded by French fur traders on 170 1, it is an important port city, a world traditional automobile center and a music city, located in the midwest of the United States, north of Windsor, Canada. The city is named after the Detroit River, which connects Lake St Clare and Lake Erie. It comes from the French word "Rivière du Détroit", which means "River of the Straits". Geography According to the statistics of the US Census Bureau, Detroit covers an area of 370.2 square kilometers, including 359.4 square kilometers of land area and 1 1 square kilometers of water area. The highest point in the city is located in the northwest of the city, about 204 meters above sea level; The lowest point of the city is located along the Detroit River, about176m above sea level. Detroit is completely surrounded by two other cities: hammett, Lamke and Highland Park. Detroit is the only big city on the US-Canada border. It is connected with Windsor, Canada through Ambassador Bridge, Detroit-Windsor Tunnel, Detroit Central Railway Tunnel and Detroit-Windsor Ferry.

Cleveland is in the United States, Cleveland (Ohio), usually referring to this city. Cleveland (Alabama) Cleveland (Florida) Cleveland (Georgia) Cleveland (Illinois) Cleveland (Minnesota) Cleveland (Mississippi) Cleveland (Missouri) Cleveland (new york) Cleveland (North Dakota) Cleveland (Oklahoma) Cleveland (new york) Cleveland (Texas) Cleveland (Utah) Cleveland (Virginia) Cleveland (Washington) Cleveland (Chipwa County, Wisconsin) Cleveland (Jackson County, Wisconsin) Cleveland (Manitowoc County, Wisconsin) Cleveland (Marathon County, Wisconsin) Cleveland (Taylor County, Wisconsin)

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