The volcanoes of Kamchatka are a large group of volcanoes situated on the Kamchatka Peninsula. The Kamchatka River and the surrounding central side valley are flanked by large volcanic belts containing around 160 volcanoes, 29 of them still active. The peninsula has a high density of volcanoes and associated volcanic phenomena, with 29 active volcanoes being included in the six UNESCOWorld Heritage List sites in the Volcanoes of Kamchatka group, most of them on the Kamchatka Peninsula.
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. Somewhat more accessible are the three volcanoes visible from Petropavlovsk-Kamchatsky: Koryaksky, Avachinsky, and Kozelsky. In the center of Kamchatka is Eurasia's world famous Geyser Valley which was partly destroyed by a massive mudslide in June 2007.