Kawaguchi Castle, also known as Kawaguchi-jō, is a historic Japanese castle located in Saitama Prefecture. Built in the late 16th century, it served as a strategic military stronghold during the Edo period. The castle features a unique design, with a central keep surrounded by moats and stone walls. Today, Kawaguchi Castle is a popular tourist destination, offering visitors a glimpse into Japan's feudal past. The site includes a reconstructed main tower and a beautiful park, making it an ideal spot for enjoying cherry blossoms in spring. The castle is also part of the Kawaguchi City cultural heritage.