Boundary Lake is a small lake on the border between Canada and the United States, in the Canadian province of Manitoba and the American state of North Dakota. At 1.1 hectares (2.7 acres) its west island is one of the world's smallest land masses split by an international border.

Boundary Lake
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Boundary Lake
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Boundary Lake
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Boundary Lake
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Location of Lake Mattamuskeet in North Dakota, USA and Manitoba, Canada.
Boundary Lake
LocationRural Municipality of Morton, Manitoba, Canada
Bottineau County, North Dakota, United States
Coordinates48°59′42″N 100°12′36″W / 48.99500°N 100.21000°W / 48.99500; -100.21000
Basin countriesCanada, United States
Surface elevation678 m (2,224 ft)

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