Among the Thousand Islands (actually more than 1,500) at the headwaters of the St. Lawrence River between Ontario and New York is a tiny island named Just Enough Room Island. It's a privately owned summer resort that has just enough room for the single house that was built on it. Atlas Obscura describes it:
[..] Just Room Enough Island was purchased in the 1950s by the Sizeland family who were looking to create a holiday get away. They built a house on the tiny speck of land placing the walls right up to the edges of the island, creating a home that was just big enough to fit, and giving the island its quirky name. A pair of bench chairs were placed in front of the home and there was also a tree growing on one side. And that is all the room the island had.
Photo: Omegatron