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As exciting as the huge gas fields of East Africa are , however , the strong decline in oil prices and expectations for an L-shaped recovery with low prices over the coming years are increasingly challenging the economic viability of the industry in this region .
 East Africa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 East Africa