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The bay is the terminus of the San Joaquin and Sacramento River systems , which drain about half the area of California , provide drinking water for millions of people and irrigate nearly half the nation 's fruit and vegetable production .
 location contains: California, San Joaquin
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  California, San Joaquin 
Answer:
 location contains: California, San Joaquin