Boundary Pass is a

strait A strait is a water body connecting two seas or water basins. The surface water is, for the most part, at the same elevation on both sides and flows through the strait in both directions, even though the topography generally constricts the ...

that runs for about along the boundary between the U.S. state of Washington and the

Canadian province Canada has ten provinces and three territories that are sub-national administrative divisions under the jurisdiction of the Constitution of Canada, Canadian Constitution. In the 1867 Canadian Confederation, three provinces of British North Amer ...

British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...

. It connects

Haro Strait The Haro Strait is one of the main channels connecting the Strait of Georgia to the Strait of Juan de Fuca, separating Vancouver Island and the Gulf Islands in British Columbia, Canada from the San Juan Islands of Washington (state), Washington st ...

to the south with the Strait of Georgia to the north. The

USGS The United States Geological Survey (USGS), founded as the Geological Survey, is an government agency, agency of the United States Department of the Interior, U.S. Department of the Interior whose work spans the disciplines of biology, geograp ...

defines its northern boundary as a line extending from East Point on

Saturna Island Saturna Island is a mountainous island, about in size, in the Southern Gulf Islands chain of British Columbia, Canada. It is situated approximately midway between the Lower Mainland of B.C. and Vancouver Island, and is the most easterly of the ...

to Alden Point on Patos Island. Its southeastern boundary is a line from Alden Point on Patos Island to Point Hammond on Waldron Island then from Sandy Point on Waldron Island to Charles Point on Stuart Island. Its southwestern boundary is a line connecting Turn Point on Stuart Island to Point Fairfax on

Moresby Island Moresby Island () is a large island () that forms part of the Haida Gwaii archipelago (formerly known as Queen Charlotte Islands) in British Columbia, Canada, located at It is separated by the narrow Skidegate Channel from the other princip ...

. Its western boundary is a line running from Pelorus Point on Moresby Island to Wallace Point on North Pender Island then to Tilly Point on South Pender Island then from Teece Point on South Pender Island to Taylor Point on Saturna Island.

References

{{Authority control Borders of Washington (state) Landforms of the Gulf Islands Straits of San Juan County, Washington Straits of British Columbia Straits of Washington (state) Borders of British Columbia Canada–United States border International straits