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Discovery Passage
French: Passage Discovery
Discovery Passage.jpg
Looking south from between Vancouver Island and Sonora Island
Discovery Passage is located in British Columbia
Discovery Passage
Discovery Passage
Location in British Columbia
Location British Columbia, Canada
Coordinates 50°13′N 125°23′W / 50.217°N 125.383°W / 50.217; -125.383
Type Strait
Part of Inside Passage, Discovery Islands
Ocean/sea sources Salish Sea
Max. length 25 km (16 mi)
Max. width 2 km (1.2 mi)
Max. depth 100 m (330 ft)
Sections/sub-basins Seymour Narrows

Discovery Passage (French: Passage Discovery) is a strait that forms part of the Inside Passage between Vancouver Island and the Discovery Islands of British Columbia. The strait is considered the most important natural passage for vessels' entering or leaving the Salish Sea from the north.


The strait was named by Captain Vancouver in 1792 after his ship, HMS Discovery. Other sources say that the passage was named by Captain Kellett because Vancouver's Discovery had sailed through the passage earlier.


The strait has a length of 25 km (16 mi) and an average width of 2 km (1.2 mi), narrowing to only 750 m (820 yd) at Seymour Narrows. Most of the eastern shoreline of the passage is Quadra Island, with Sonora Island forming the shoreline at the northern end where Discovery Passage meets Johnstone Strait. The southern end of Discovery Passage enters the Strait of Georgia, the northern arm of the Salish Sea.

The strait is frequently transited by cruise ships, cargo ships, fishing boats, and ships of the Alaska Marine Highway and BC Ferries systems.

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