Rosario Strait
               
               
               
               
               
               Rosario Strait runs east of the 
San Juan Islands, northeast of 
Puget Sound, Washington State, between the 
Georgia and 
Juan de Fuca Straits. At roughly 40 km in length, it seems diminutive compared to its Spanish
                  name, first used in 1791: Gran Canal de Nuestra Senora del Rosario la Marinera.
1 It was 
Captain Kellett who, in 1847, dropped all but Rosario on his charts of the area.
2This was a strait of much consequence during the Oregon Treaty boundary disputes of
                  the latter 19th and early 20th century, which divided the United States from British
                  territory at 
the middle of the channel which separates the continent from Vancouver's Island.
3 Further to this, in this despatch, 
Douglas argues in his third point to 
Lytton that it is the Rosario and not the 
Haro Strait to which the treaty must refer:
In those Despatches I stated the reasons which induced me to assume that the Islands
                  of 
San Juan, 
Lopez and 
Orcas, to which the United States have set up a claim did of right belong to Her Majesty
                  the Queen, and come within the jurisdiction of the Government of 
Vancouver's Island, or in other words that 'Vancouver's Strait' now more generally known as 'Rosario
                  Strait' is the true channel through which the line of Water Boundary was intended
                  to be carried.
                  
                  
                     - 1. Lynn Middleton, Placenames of the Pacific Northwest Coast (Victoria: Elldee Publishing Company, 1969), 178.
- 2. Ibid.
- 3. [US] National Park Service, San Juan Island National Historical Park, Racerocks.com.