Which Japanese city had the largest population of a metropolitan area in the world at the time of the Edo Period?

During the Edo Period, Tokyo, then known as Edo, had the largest population of any metropolitan area in the world. By the early 18th century, Edo's population exceeded one million residents, making it a bustling urban center. The city's size and significance were due to its status as the political center of Japan under the Tokugawa shogunate.