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Bertrand and Vincent make a trip to the largest country in the world, Russia; Russia is home to an extremity of the pacific ring of fire, and one of its most active segments, resulting in over 150 volcanoes.
Bertrand and Vincent visit Java, Indonesia; Indonesia has the largest number and highest density of active volcanoes in the world, 127 active volcanoes with about 5 million people who have activities within the danger zone.