The land that Tokyo Station currently sits on was once part of the Edo Bay. The center of Tokyo used to be called Edo, and most of the district was sea, ponds and badly marshy. In the late 16th century, Ieyasu Tokugawa began the process of making the land useable. Ieyasu and his successors cultivated the district and promoted various industries, developing it into one of the world’s largest cities in just two centuries.