The highest volcano is Klyuchevskaya Sopka ( 4,750 m or 15,584 ft ) , the largest active volcano in the Northern Hemisphere , while the most striking is Kronotsky , whose perfect cone was said by celebrated volcanologists Robert and Barbara Decker to be a prime candidate for the world 's most beautiful volcano .
The highest volcano is Klyuchevskaya Sopka ( 4,750 m or 15,584 ft ) , the largest active volcano in the northern hemisphere . The most striking is Kronotsky , whose perfect cone was said by celebrated volcanologists Robert and Barbara Decker to be a prime candidate for the world 's most beautiful volcano .