Honshu

Honshu is the largest of Japan's four main islands.

It sits between the Sea of Japan to the west and the Pacific Ocean to the east. The island is the seventh-largest island in the world. It is also the second-most populous island after Java in Indonesia. Honshu is home to 104 million people. This represents 81.3% of the entire population of Japan. Most people live in coastal areas or on flat plains.

The geography of Honshu is defined by its mountains and volcanoes. The Japanese Alps span the width of the island. These mountains stretch from the Sea of Japan to the Pacific shore. Honshu also contains Mount Fuji. This is an active volcano and the highest peak in Japan.

Another important feature is Lake Biwa. This is the largest lake in the country. The island's land area is actually increasing. This happens because of land reclamation and coastal uplift. This uplift is caused by plate tectonics at a convergent boundary. The island has a very long coastline. It is slightly larger in area than Britain.

Climate patterns on Honshu vary by region. Northern Honshu has four distinct seasons. The temperatures change significantly throughout the year. Central Honshu experiences heavy winter snowfall. This happens near the Japanese Alps in prefectures like Niigata, Toyama, and Nagano. Humid air masses from the Sea of Japan collide with the mountains. This makes these areas some of the snowiest inhabited places on Earth. Southern Honshu has a different climate. It features long, hot summers and mild winters.

Human history on the island began approximately 37,000 years ago. Stone Age hunter-gatherers arrived from Northeast Asia. They likely followed the migration of Ice Age megafauna. Archaeologists have found finely crafted stone blades similar to those in Siberia. Later, the Jōmon period emerged. The Jōmon people created distinctive cord-marked pottery. They also made dogū clay figurines. These artifacts suggest complex spiritual lives and early sedentary communities. Honshu was also the center of political power. It held former capitals like Kyoto, Nara, and Kamakura.

In 1868, the Meiji Restoration changed Japan's government. This political revolution ended the Tokugawa shogunate. It brought an end to the Edo Period. Control returned to direct imperial rule under Emperor Meiji. Leaders of this movement included young samurai from Chōshū. Chōshū was a feudal area in far western Honshu. This area was hostile to the previous military government.

Modern Honshu is a massive center for industry and population. A large industrial belt runs along the southern coast. This belt connects Tokyo, Nagoya, Kyoto, Osaka, Kobe, and Hiroshima. Much of the population lives in the Taiheiyō Belt. This is a megalopolis that spans several Japanese islands. Tokyo is the largest city with nearly 14 million people. The Greater Tokyo Area is the most populous metropolitan area in the world.

Because Honshu sits on the Ring of Fire, it is seismically active. The island contains 40 active volcanoes. It experiences frequent earthquakes. In March 2011, a massive earthquake occurred off the coast. It had a magnitude between 9.0 and 9.1. This was the most powerful earthquake recorded in Japan. It was also the fourth most powerful in the world since 1900. The quake moved parts of the island by as much as 2.4 meters. It also generated tsunamis up to 40.5 meters high. These waves led to the Fukushima nuclear disaster.

Honshu is connected to other islands by many structures. It links to Hokkaido via the Seikan Tunnel. It connects to Kyushu through the Kanmonkyo Bridge and Kanmon Tunnel. There are also many bridges across the Inland Sea. These connect Honshu to Shikoku. These bridges include the Akashi Kaikyo Bridge and the Ōnaruto Bridge. These links allow for easy travel across the Japanese archipelago.