<P> El Camino Real ( Spanish for The Royal Road , also known as The King 's Highway ) , sometimes associated with Calle Real ( within the US state of California ) , usually refers to the 600 - mile ( 965 - kilometer ) road connecting the 21 Spanish missions in California ( formerly Alta California ) , along with a number of sub-missions , four presidios , and three pueblos , stretching at its southern end from the San Diego area Mission San Diego de Alcalá , all of the way up to the trail 's northern terminus at Mission San Francisco Solano in Sonoma , just above San Francisco Bay . </P>
where does the el camino real start and end
the San Diego area Mission San Diego de Alcalá Mission San Francisco Solano in Sonoma , just above San Francisco Bay