32255
These powers had perceived , understood and increasingly followed the imperative of controlling the lower Mekong basin as the key to control all Indochina .
 Mekong, Indochina
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mekong, Indochina