The Sea of Cortes (commonly referred to as the Gulf of California) lies between the Baja Peninsula and mainland Mexico. Glorified in Steinbeck’s narrative The Log from the Sea of Cortes, detailing his adventures with Ed Ricketts during a six-week collecting trip, the region is rich in both history and biodiversity. The sea is formed by the separation of the Pacific and North American tectonic plates. The East Pacific Rise runs through the Sea of Cortes and continues north to become the San Andreas Fault. The Colorado River empties into the sea at the Colorado River Delta.