61401
Southwestern Mauritania is predominantly a Wolof-speaking area , but many members of Mauritania 's other ethnic groups have moved to the town to escape the severe problems of desertification further north .
 Mauritania, Mauritania
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mauritania, Mauritania