The town is bordered by the Brewster Flats, an extensive stretch of tidal sand flats to the north, along the shores of Cape Cod Bay. The town is home to the Roland C. Nickerson State Forest Park, the largest state forest on Cape Cod. The town has several large ponds, especially along the Harwich town line. There are several brooks throughout the town, all of which lead to Cape Cod Bay. The bay is home to several boat landings and beaches in the town.