Inside the caldera, asre two islands, which are fusion of a number of volcanic cones thrown up from the bottom of caldera. After the great cataclysm there was a period of quiescence lasting about 1300 years. Then in 198 BC a volcanic island was thrown up and called Hierra. In AD 46 another eryption, about 400 yds(370m) away, created another island, named Theia and in AD 60 a third eruption completely united the two islands. In AD 726 a fourth eraption increases the size of the island created by the union of Hiera and Theia. In AD 1457 and 1508 further eruptions increased the size of this island, but there has been no further activity in this island, which reached its present shape at thei point. It is now called Palea (Old) Kameni and its highestpoint is about 330 ft(110m) above sea level. In AD 1573, about 65 years after Palea Kameni reached its present form, activity broke out some 2600yds (2400m) North-East of the centre of Palea Kameni and a small oval island(500x300 m) came into being. This was called Mikra (Small) Kameni. In 1707 volcanic activity started again, this time some 217 yds(200m) West of Small Kameni. Two volcanic cones appeared and were named Aspronisi and Macronesi. These were united in the course of five years to form a third islet, between Old and Small Kameni, larger and higher than either, and named Nea (New) Kameni.