<Tr> <Td> 19 </Td> <Td> Gravois Park </Td> <Td> 39 </Td> <Td> Forest Park Southeast </Td> <Td> 59 </Td> <Td> JeffVanderLou </Td> <Td> 79 </Td> <Td> North Riverfront </Td> </Tr> <Tr> <Td> 20 </Td> <Td> Kosciusko </Td> <Td> 40 </Td> <Td> Kings Oak </Td> <Td> 60 </Td> <Td> St. Louis Place </Td> </Tr> <P> According to the United States Census Bureau, St. Louis has a total area of 66 square miles (170 km), of which 62 square miles (160 km) is land and 4.1 square miles (11 km) (6.2%) is water . (Not shown on simple maps of the city, the land at its airport is owned by the city, served by its fire department and others, and is an exclave of St. Louis .) The city is built primarily on bluffs and terraces that rise 100--200 feet above the western banks of the Mississippi River, in the Midwestern United States just south of the Missouri - Mississippi confluence . Much of the area is a fertile and gently rolling prairie that features low hills and broad, shallow valleys . Both the Mississippi River and the Missouri River have cut large valleys with wide flood plains . </P> <P> Limestone and dolomite of the Mississippian epoch underlie the area, and parts of the city are karst in nature . This is particularly true of the area south of downtown, which has numerous sinkholes and caves . Most of the caves in the city have been sealed, but many springs are visible along the riverfront . Coal, brick clay, and millerite ore were once mined in the city . The predominant surface rock, known as St. Louis limestone, is used as dimension stone and rubble for construction . </P>

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