The Strait of Georgia or the Georgia Strait is a strait between Vancouver Island (as well as its nearby Gulf Islands) and the mainland coast of British Columbia, Canada. It is approximately 240 kilometres (150 mi) long and varies in width from 18.5 to 55 kilometres (11.5 to 34.2 mi). Archipelagos and narrow channels mark each end of the Strait of Georgia, the Gulf Islands and San Juan Islands in the south, and the Discovery Islands in the north. The main channels to the south are Haro Strait and Rosario Strait, which connect the Strait of Georgia to the Strait of Juan de Fuca. In the north, Discovery Passage is the main channel connecting the Strait of Georgia to Johnstone Strait.