Japan is an island country in East Asia located in the northwest Pacific Ocean. It is an archipelago consisting of nearly 7,000 islands, but the four largest islands—Honshu, Hokkaido, Kyushu, and Shikoku—make up about 97% of its land area. Tokyo, the capital and most populous city, is located on Honshu. Japan is very mountainous, with approximately 73% of its terrain being unsuitable for agriculture or industry, leading to high population densities in coastal plains. It is situated on the Pacific Ring of Fire, making it prone to frequent earthquakes and volcanic activity; Mount Fuji is its highest and most iconic volcano. The climate varies significantly from the humid continental climate of Hokkaido in the north to the subtropical climate of Okinawa in the south. Japan is a leading technological power and has the world's third-largest economy. Its culture is a unique blend of ancient traditions and modern innovation.