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Lake, southeastern Louisiana, U.S. It is 40 mi (64 km) long and 25 mi (40 km) wide, with an area of 630 sq mi (1,631 sq km). More a tidal lagoon than a lake, it is brackish and teems with game fish. It is connected through Lake Borgne with the Gulf of Mexico and by canal with the Mississippi River. It is spanned by the Pontchartrain Causeway, two parallel road bridges which cross the lake north of New Orleans and, at nearly 24 mi (39 km) in length, are the longest overwater bridges in the world.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Pontchartrain, Lake, visit Britannica.com.