Nanao Castle is a historic Japanese castle located in Nanao City, Ishikawa Prefecture. Built in the late 16th century, it served as a strategic military base during the Sengoku period. The castle is known for its unique design, featuring a series of stone walls and moats that provided defense against invaders. Today, the castle ruins are a popular tourist attraction, offering scenic views of the surrounding area. Visitors can explore the remnants of the castle, including the stone walls and the foundation of the main keep. The site is also a designated Historic Site of Japan, reflecting its cultural significance.