How many castles were there in Japan during the 16th century?

During the 16th century, Japan had an estimated 2,000 castles, primarily built as fortifications during the feudal period. These castles served as the residences of daimyō (feudal lords) and were strategically important in military defense and governance. The castles varied in size and complexity, with notable examples like Himeji Castle emerging during this time. However, many of these structures were later destroyed or altered in subsequent periods.