Arizona developers would like to build a mini-city on half of 1,433 acres of San Francisco Bay in Redwood City that have been used for salt ponds for years, and they claim that the area is an "industrial site" and not part of the Bay. Take a look for yourself at these pictures. The salt didn't fall from the sky - it's an area of the Bay that has been manipulated to harvest the salt that the Bay waters brought it. In rainy season (and whenever Bay water was allowed in), the salt ponds look like the rest of the Bay. And just because the land under the water you see here has been used to make salt, doesn't change what it was and remains, unless it gets filled in.