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The Lake Pontchartrain Causeway, or the Causeway, consists of two parallel bridges crossing Lake Pontchartrain in southern Louisiana. The longer of the two bridges is either the longest or second-longest in the world depending on definitions, measuring at 23.87 miles (38.42 km) long. The Bang Na Expressway, a viaduct in Bangkok, is longer at 54 kilometres (33.55 mi), but is excluded from most lists of longest bridges because it crosses water for only a minimal portion of its length.