Why do so many Japanese live on the coast?

Many Japanese people live on the coast due to the country's geography, which includes mountainous terrain that limits available land for habitation and agriculture. Coastal areas provide access to the ocean, facilitating trade, fishing, and tourism, which are vital to the economy. Additionally, historical development patterns and urbanization have concentrated populations in coastal cities, leading to vibrant economic and cultural hubs. As a result, the coast has become the primary area for settlements in Japan.