The Rancho Laguna was a diamond shaped section of land of surrounding Laguna Lake at the head of the Los Osos Valley. It was bounded by a line through the Irish Hills on the southwest, a line bordering that of the Rancho Cañada de los Osos y Pecho y Islay on the northwest, a line running along the south slope of the Cerro San Luis Obispo to a point at the intersection of Elks Lane and Huigera Street on the northeast, and a line on the southeast to the starting point just south of the common boundary with the Ranchito de Santa Fe.