, image = Monarch Head (7604530136).jpg , image_size = 250px , alt = , caption = View of Boundary Pass from Monarch Head,

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 ...

, image_bathymetry = Locmap-Haro-Boundary additional labels.png , alt_bathymetry = , caption_bathymetry = Map of Boundary Pass and

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 sta ...

according to

USGS The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, a ...

definitions , location =

British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...

and

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

, group = , coordinates = , type =

Strait A strait is an oceanic landform connecting two seas or two other large areas of water. The surface water generally flows at the same elevation on both sides and through the strait in either direction. Most commonly, it is a narrow ocean channe ...

, etymology = , part_of =

Salish Sea , image = PNW-straits.jpg , alt = , caption = The Salish Sea, showing the open Pacific Ocean at lower left, and from there, heading inland: the Strait of Juan de Fuca, the narrow Puget Sound at lower ri ...

, inflow = , rivers = , outflow = , oceans = , catchment = , basin_countries =

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

and

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

, agency = , designation = , date-built = , engineer = , date-flooded = , length = , width = , area = , depth = , max-depth = , volume = , residence_time = , salinity = , shore = , elevation = , temperature_high = , temperature_low = , frozen = , islands = , islands_category = , sections = , trenches = , benches = , cities = , pushpin_map = British Columbia , pushpin_label_position = , pushpin_map_alt = , pushpin_map_caption = , website = , reference = Boundary Pass is a

strait A strait is an oceanic landform connecting two seas or two other large areas of water. The surface water generally flows at the same elevation on both sides and through the strait in either direction. Most commonly, it is a narrow ocean channe ...

that runs for about along the boundary between the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sover ...

and the

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

. It connects

to the south with the

Strait of Georgia The Strait of Georgia (french: Détroit de Géorgie) or the Georgia Strait is an arm of the Salish Sea between Vancouver Island and the extreme southwestern mainland coast of British Columbia, Canada and the extreme northwestern mainland coast ...

to the north. The

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

to Alden Point on

Patos Island Patos Island is a small island in the San Juan Islands of the U.S. state of Washington. Since 1893, it has been home to the Patos Island Lighthouse, guiding vessels through Boundary Pass between Canada and the United States. The name comes from ...

. Its southeastern boundary is a line from Alden Point on Patos Island to Point Hammond on

Waldron Island Waldron, also known as Waldron Island, is an unincorporated community in San Juan County, Washington, United States. Its population was 104 at the 2000 census. Waldron is in the San Juan Islands. It is designated as a Limited Development District ...

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 ( hai, Gwaii Haanas) 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 ...

. Its western boundary is a line running from Pelorus Point on Moresby Island to Wallace Point on North

Pender Island Pender Island ( Saanich: ) is one of the Southern Gulf Islands located in the Gulf of Georgia, British Columbia, Canada. Pender Island is approximately in area and is home to about 2,250 permanent residents, as well as a large seasonal populati ...

then to Tilly Point on South Pender Island then from Teece Point on South Pender Island to Taylor Point on Saturna Island.

References

{{British Columbia hydrography 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