32321
Its waters ' flow reverses direction every year , caused by greatly varying amounts of water carried by the Mekong over the course of a year and the impact of monsoonal rains , that coincides with the river 's maximum .
 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: Mekong 
Answer:
 location: Mekong