The Maestri Bridge, also known as Lake Pontchartrain Causeway, carries US Route 11 over Lake Pontchartrain in southeastern Louisiana. Lake Pontchartrain is a brackish estuary north of New Orleans; it is the second-largest saltwater lake in the United States after the Great Salt Lake.
The Sabine River forms two-thirds of the border with Texas, the Mississippi and the Pearl River define sections of the border with the state of Mississippi.
Louisiana originally designated the vast region of the Mississippi basin, which the French explorer La Salle claimed for France in 1682. The French sold the land to the USA as part of the Louisiana Purchase of 1803. The smaller area now known as Louisiana became the 18th state of the USA in 1812.