Four ponds on San Francisco Bay used for commercial salt production. Three of the ponds have been drained and the salt is being harvested in the top pond. The bottom pond has not been drained and is red because of the red algae that grow in the high salinity. (By permission from Cargill Salt Company, ©Cargill Salt Company, http://www.cargillsalt.com/sfbay/index.html) (Return to "Does table salt come from the ocean?")