57906
At its height it encompassed an area covering not only most of Chad , but also parts of southern Libya ( Fezzan ) and eastern Niger , northeastern Nigeria and northern Cameroon .
 Chad, Libya, Fezzan, Niger, Nigeria, Cameroon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chad, Libya, Fezzan, Niger, Nigeria, Cameroon