The Carquinez Strait is a narrow waterway located in northern California, connecting the Sacramento River to the San Francisco Bay. It serves as a natural boundary between Contra Costa County and Solano County. The strait is approximately 14 miles long and plays a crucial role in local navigation and ecology. Surrounding the Carquinez Strait are several parks and natural reserves, including the Carquinez Strait Regional Shoreline. This area is known for its scenic views, diverse wildlife, and recreational opportunities such as hiking and boating. The strait is also significant for shipping and transportation in the region.