Geological formation, Volcanic / thermal

Giant's Causeway
The Giant's Causeway is an area of 40,000 interlocking basalt columns resulting from a volcanic eruption.
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Hawaii Volcanoes
Hawaii Volcanoes National Park is an excellent example of island building through volcanic processes.
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Heard and McDonald Islands
Heard Island and McDonald Islands are uninhabited, barren islands located in the Southern Ocean, with a complete absence of alien plants and animals, as well as human impact.
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Hierapolis-Pamukkale
Hierapolis-Pamukkale was an ancient spa: the hot springs here have been used as a spa since the 2nd century BC.
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Isole Eolie
The Isole Eolie (Aeolian Islands) consist of seven islands off the northern coast of Sicily that are known for their worth for vulcanology.
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Jeju
The Jeju volcanic island is an example of a large shield volcano, a lesser common type of volcano and rare in its enviromental setting.
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Macquarie Island
Macquarie Island is the only place on earth where rocks from the earth's mantle (6 km below the ocean floor) are being actively exposed above sea-level.
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Pitons Management Area
The Pitons Management Area consists of two lava domes or volcanic plugs that were made a WHS because of their volcanic history and aesthetic qualities.
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Pitons of Reunion
The Pitons, cirques and remparts of Reunion Island are renowned for their visually striking landscape and remaining high numbers of endemic plant species.
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Surtsey
Surtsey is a volcanic island that was formed in a volcanic eruption in the sea which reached the surface on 14 November 1963.
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Teide National Park
Teide National Park features the visually impressive Teide-Pico Viejo volcano, the third tallest volcanic structure in the world.
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Ujung Kulon National Park
Ujung Kulon National Park contains the largest remaining lowland rainforest in Java and is also one of only two homes of the critically endangered Javan Rhinoceros.
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Volcanoes of Kamchatka
The Volcanoes of Kamchatka are one of the most outstanding examples of the volcanic regions in the world.
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Yellowstone
Yellowstone National Park is located in the seismically most active area of the Rocky Mountains and shows globally unparalleled surficial geothermal activity.
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