Occasional large wetlands occur along the river. One of the largest is the Innisville Wetlands, a provincially significant wetland that is also designated an Area of Natural and Scientific Interest. Another large wetland is the Appleton Silver Maple Swamp. These wetlands depend upon the seasonal cycles of the river. High water periods in the spring flood large areas creating wetland soils and large areas of marsh. As water levels slowly fall, conditions suitable for swamp forests occur. This natural seasonal alternation between high and lower water levels is essential for creating the natural diversity of wetlands along the river.