泥沼【どろぬま】
bog, marsh, swamp, quagmire, morass, quandary, dire situation from which one cannot extricate oneself, imbroglio
湖沼【こしょう】
lake, marsh, wetland, inland waters
沼田【ぬまた】
marshy rice field or paddy
沼地【ぬまち】
marshland, wetland, swampland
沼沢【しょうたく】
marsh, swamp, bog