Islands and archipelagos
It is obvious that the geological structures and geographical features of Southeast Asia and East Asia are islands and archipelagos, namely the areas of india (Andaman and Nicobar archipelago) Indonesia, Philippines, Taiwan and Japan. The Islands in this area, called the Pacific Ring of Fire , were formed from shells of age earlier than the Tertiary Period
Thus, Earthquakes and Volcanic eruptions are usually occurred in this area. The outstanding tsunami that hit Thailand was caused by the earthquake happened in the Southwest of Sumartra Island, which is situated in this region. Important
The area of Indonesia