Detroit is a major port located on the Detroit River, one of the four major straits that connect the Great Lakes system to the Saint Lawrence Seaway. The Detroit Metropolitan Airport is among the most important hubs in the United States. The City of Detroit anchors the second-largest regional economy in the Midwest, behind Chicago and ahead of Minneapolis-St. Paul, and the 13th-largest in the United States. Detroit and its neighboring Canadian city Windsor are connected through a tunnel and the Ambassador Bridge, the busiest international crossing in North America. Detroit is best known as the center of the U.S. automobile industry, and the “Big Three” auto manufacturers General Motors, Ford, and Chrysler are all headquartered in Metro Detroit.
According to the U.S. Census Bureau, the city has a total area of 142.87 square miles (370.03 km2), of which 138.75 square miles (359.36 km2) is land and 4.12 square miles (10.67 km2) is water. Detroit is the principal city in Metro Detroit and Southeast Michigan situated in the Midwestern United States and the Great Lakes region. (Source, Wikipedia)