46620
The controversial Pak Mun Dam , which is charged with causing environmental damage , is near the river 's confluence with the Mekong .
 location: Pak Mun Dam; location: Mekong
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Pak Mun Dam, Mekong 
Answer:
 location: Pak Mun Dam; location: Mekong