339632
It is abundant in the countries surrounding the rift valley lakes of eastern Africa : Tanzania , Kenya , Uganda , Rwanda , Burundi , Sudan , and the Democratic Republic of Congo .
 Tanzania, Kenya, Uganda, Rwanda, Burundi, Sudan, Democratic Republic of Congo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tanzania, Kenya, Uganda, Rwanda, Burundi, Sudan, Democratic Republic of Congo