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The Chao Phraya River flows through Central Thailand from the confluence of the Ping and Nan Rivers at in Nakhon Sawan Province southward to its mouth in Samut Prakan Province , where it drains into the Gulf of Thailand .
 Central Thailand, Nakhon Sawan Province, Samut Prakan Province, Thailand
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Central Thailand, Nakhon Sawan Province, Samut Prakan Province, Thailand