The answer is A. The legend.
I hope this helps, have a nice day.
~Hello there!
Your question: The world's largest geothermal pool is located in which country?
Your answer: The world's largest geothermal pool is located in the United States of America. Specifically, it is located in Mayacamas Mountains, San Francisco. The world's largest geothermal pool is called 'The Geysers'
Any queries ^?
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Answer:
It helps promote the conservation of land by bringing in tourism (which helps the economy)