Discovery Passage is a channel that forms part of the Inside Passage between Vancouver Island and the Discovery Islands which lie off the British Columbia coast north of the Georgia Strait. It was named by Captain Vancouver for his ship, the . 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. It is in length and is typically about in width, less at Seymour Narrows which lies in the lower half of Discovery Passage.