Location and Geography.

The Japanese archipelago consists of four major islands and over six-thousand minor ones, covering approximately 234,890 square miles (378,000 square kilometers), and has enormous climatic variation. The four major islands are Hokkaidō, Honshū, Shikoku, and Kyūshū. The southern island group of Okinawa (the Ryūkyū Islands) is geographically, historically, and culturally distinct.

Japan faces the Pacific Ocean along the entire eastern and southern coastline. To the north and west are the Sea of Okhotsk, the Sea of Japan, and the East China Sea. The Korean peninsula is the closest point on the Asian mainland. Japanese life has always been oriented toward the ocean. The currents that converge offshore create fertile and varied fishing grounds. 

The climate is shaped by Asian-Pacific monsoon cycles, which bring heavy rains from the Pacific during the summer and fall, followed by icy winds from North Asia during the winter that dump snow in the mountains.
There are approximately 1,500 volcanoes, and because the islands lie on major fault lines, earthquakes are common occurrences. Only about 15 percent of the land is level enough for agriculture, and so the population density in coastal plains and valleys is extremely high. Because of the steep mountains, there are almost no navigable inland waterways.