The Strait of Georgia contains estuaries, salt marshes, and other productive habitat. The entire Strait is 135 miles long, and drains hundreds of rivers, including the 850-mile Fraser River. It is an important site for recreation, tourism, and commercial fishing and shellfish harvest. According to Parks Canada, the southern Strait is one of the most at-risk ecosystems in the country.
- Counties: Skagit, Whatcom
- National Estuary Programs: Puget Sound
- Other Watersheds Upstream: Nooksack
- Other Watersheds Downstream: Puget Sound