The Lake Pontchartrain Causeway, or the Causeway, consists of two change bridges that are the long bridges in the humankind by sum length. These line bridges crosswise Lake Pontchartrain in gray Louisiana. The somebody of the two bridges is 23.87 miles (38.42 km) long. The bridges are fostered by over 9,000 concrete 8 miles (13 kms) southeast of the northernmost beam. The grey term of the Causeway is in Metairie, Louisiana, a suburbia of New Orleans. The blue goal is at Mandeville, Louisiana.