The township consists of Drummond Island, one of the largest islands in Lake Huron. M-134 runs through the western portion of the island. The highway connects with the mainland portion via the Drummond Island Ferry, which runs between De Tour Village and the island.
On the east side of Drummond Island, the Canada–United States border passes through the False Detour Channel. On the other side of that channel, the Canadian Cockburn Island separates Drummond from Manitoulin Island.
The township and island are named after Gordon Drummond, who was the first Canadian-born officer to command the military and the civil government of British Canada. As Lieutenant Governor of Upper Canada, Drummond distinguished himself on the Niagara front in the War of 1812 and later became Governor-General and Administrator of Canada. The Ojibwe name for the island is Potagannissing.