Japan is a major island nation located in East Asia, situated in the Pacific Ocean off the northeast coast of the Asian mainland. The archipelago, comprising four main islands—Hokkaido, Honshu, Shikoku, and Kyushu—and thousands of smaller islands, is characterized by its unique blend of ancient traditions and hyper-modern technology. With a population exceeding 125 million people, Japan boasts the world's largest metropolitan area in the Greater Tokyo region. The country's geography is dominated by mountainous terrain, which has historically concentrated its population and economic activity along the fertile eastern coastal plains. Due to its location on the Pacific Ring of Fire, Japan is highly susceptible to seismic activity, making earthquake preparedness a defining feature of its national infrastructure and culture.