The Pajaro River, in Central Coast , forms part of the border between San Benito County and Santa Clara County, the entire border between San Benito County and Santa Cruz County, and the entire border between Santa Cruz County and Monterey County. Flowing roughly east to west, the river empties into Monterey Bay, west of Watsonville, California.HistoryThe first European land exploration of Alta California, the Spanish Portolà expedition, camped near the river for two nights, in the vicinity of today's community of Pajaro, on October 8–9, 1769. The party continued north the next day toward Santa Cruz. Expedition soldiers called it "Pajaro" (meaning "bird" in Spanish) because the natives they saw there had a large stuffed bird. Franciscan missionary Juan Crespi, traveling with the expedition, noted in his diary that, "to some of our party it looked like a royal eagle" (possibly an osprey).The Pajaro River has had many names. Early Spanish maps had the name Rio de San Antonio and Rio del Pajaro. Alternate names included Pigeon River, Rio de La Senora La Santa Ana, Rio del Paxaro, Rio de Santa Ana, San Antonio River and Sanjon del Tequesquite.
