Natural areas in King, Ontario

[2] Pottageville Swamp,[3] which was originally contiguous with the Holland Marsh, is now isolated from it because of drainage in the 1920s to prepare the land for agricultural use.

[4] Cold Creek Conservation Area is a park and reserve on the south slope of the Oak Ridges Moraine, northwest of Nobleton, at the southwestern edge of the township.

[7] The Kettleby and Newmarket Tills is a small region of sediments deposited by the Lake Simcoe ice lobe,[8] located west of the Glenville Hills Kames.

These constituent wetlands are each situated at the headwater area of the East Humber River watershed in King City.

"[9] The much larger Pottageville Wetland Complex, which is adjacent to Happy Valley Forest on its northern border, also lies on the Oak Ridges Moraine.

[10] Overlapping the northern border of the township is Ansnorveldt Wetland Complex, a 200-hectare (490-acre) zone bounded by the Holland Marsh to the east and northeast.