A floating wetland structure designed for placement in a body of water includes: at least one surface module having an upper surface at or above the water level； at least one submerged module below the water level； and a frame interconnecting the surface module and submerged module. The frame maintains the surface module as horizontally offset from the submerged module such that an open water area is defined. The floating wetland structure can have an alternating arrangement of surface modules and submerged modules. The frame may include lengthwise extending members and laterally extending members. Horizontally extending lower members may be interconnected with the upper members by vertically extending members that maintain the submerged module below the water level.
