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Shaan-Gan-Ning ( 陕甘宁边区 ) was one of the two border region governments with the capital at Yan ' an , named after the provinces of Shaanxi , Gansu , Ningxia .
 Yan ' an, Shaanxi, Gansu, Ningxia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yan ' an, Shaanxi, Gansu, Ningxia