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Lord Howe Island, Australia (flickr: dexodexo)

“Lord Howe Island is the eroded remnant of a large shield volcano which erupted from the sea floor intermittently for about 500,000 years in the late Miocene (6.5-7 million years ago). The island group represents the exposed peaks of a large volcanic seamount which is about 65 km long and 24 km wide and which rises from ocean depths of over 1,800 m. Four separate series of volcanic rocks are recognized on the main island group: tuffs, breccia and basalts, with widespread intrusion of basaltic dykes. The dominant landforming process on Lord Howe since the last of the volcanic eruptions has been marine erosion, which has cut and maintained major cliffs. Slope failure and accumulation of talus at the foot of some cliffs, especially in the south, have modified their original shape.” — unesco.org