Lake Pontchartrain (pronounced /ˈpɒntʃətreɪn/ in English; Lac Pontchartrain, IPA [lak pɔ̃ʃaʀtʀɛ̃] in French) is a brackish lake in southeastern Louisiana. It is the second largest salt-water lake in the United States, after the Great Salt Lake in Utah, and the largest lake in Louisiana.