The lower Latrobe wetlands are Sale Common, Dowd Morass and Heart Morass. The wetlands are on the floodplain of the Latrobe River between its confluence with the Thomson River and Lake Wellington.
River regulation and water extraction from the Latrobe, Thomson and Macalister rivers has reduced the frequency of small- and medium-sized floods that naturally inundate the wetlands. This problem is worsened by saline water intrusion into Dowd Morass and Heart Morass from Lake Wellington. Construction of levees and drains and the filling in of natural depressions have also altered water movement in and through the wetlands. However, the drainage and flooding regime in all three wetlands can be managed to some extent through the use of regulators connected to the Latrobe River.