Whats the biggest walmart in San Francisco?

I was shocked at how busy the Union City store was at 3 a.m. on a Saturday morning. Er, maybe it’s the biggest, I dunno.

http://www.walmart.com/storeLocator/ca_storefinder_results.do?sfsearch_city=san+francisco&sfsearch_state=CA&sfsearch_zip=&x=37&y=19&continue=

Hi sorry, I’m new here, I should have clarified I mean the “bay area”, just near to san francisco, I know there are three near here, but have not found which is the biggest.

I have not visited all the Wal-Marts in the Bay Area, but I have been to several in a vain search for freshwater snails for my little sister, which we originally purchased at this one:

4. (on the list that @frdelrosario linked)
Walmart Store #5434
15555 Hesperian Blvd
San Leandro, CA 94579
(510) 351–0108

That one out of all seemed to be the biggest, with the biggest selection of items in general, and it is the only one I’ve found to date that has an aquatic section with live fish/snails.