46620
The controversial Pak Mun Dam , which is charged with causing environmental damage , is near the river 's confluence with the Mekong .
 Pak Mun Dam, Mekong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pak Mun Dam, Mekong