To the south of the town, between Little Ponton and Saltersford, the River Witham flows through marshes and water meadows. These support a variety of plant species including vetches, cowslip, "Primula veris", Lady's bedstraw {Galium verum}, and orchids, including the Southern Marsh Orchid, and wildlife, including herons, ducks, geese, water vole, and the now critically endangered white clawed crayfish. This area has notable populations of dragonflies, especially "Aeshna grandis", "Anax imperator", "Libellula quadrimaculata" and "Calopteryx splendens", that are also found on Grantham Canal, which runs through The Vale of Belvoir to the west of the town. Wildlife can also be found in the town's Wyndham and Dysart Parks.