The strait was named by Captain Vancouver in 1792 after his ship, HMS Discovery.[2] Other sources say that the passage was named by Captain Kellett because Vancouver's Discovery had sailed through the passage earlier.[3]: 63
Geography
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.