No its not a joke. Central Valley used to be a big marshy area https://en.wikipedia.org/wiki/Sacramento%E2%80%93San_Joaquin_River_Delta#/media/File:Map_of_the_S

No its not a joke. Central Valley used to be a big marshy area https://en.wikipedia.org/wiki/Sacramento%E2%80%93San_Joaquin_River_Delta#/media/File:Map_of_the_San_Joaquin,_Sacramento_and_Tulare_Valleys_1873.jpg https://en.wikipedia.org/wiki/Sacramento%E2%80%93San_Joaquin...