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Geography and location Located in the Dien Bien Province of Northwestern Vietnam , the Muong Thanh valley lies at the crossroads of many different modern political boundaries .
 Dien Bien, Vietnam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dien Bien, Vietnam