Which bridge is the world’s longest continuous bridge over water, crossing Lake Pontchartrain in Louisiana?

The Lake Pontchartrain Causeway is the world’s longest continuous bridge over water.

The causeway consists of two parallel concrete bridges crossing Lake Pontchartrain in southeastern Louisiana. The longer span measures about 23.87 miles, or 38.42 kilometres, between the north shore near Mandeville and the south shore near Metairie.

The first roadway opened in 1956, and the parallel southbound structure opened in 1969. Thousands of concrete pilings support the causeway across the lake, with a bascule bridge allowing boats to pass through the navigation channel.

It is often confused with the Hong Kong–Zhuhai–Macao Bridge, which is a larger sea-crossing system but includes tunnels and artificial islands. The causeway’s record specifically concerns a continuous bridge over water.