Oshi Castle is a historic Japanese castle located in Saitama Prefecture. Built in the 15th century, it served as a strategic military stronghold during the Sengoku period. The castle is known for its unique flatland design, which is different from many hilltop castles in Japan. Today, it features reconstructed structures and beautiful gardens, attracting visitors interested in history and architecture. The castle is also famous for its scenic views, especially during the cherry blossom season. Visitors can explore the castle grounds, learn about its history, and enjoy the surrounding natural beauty. Oshi Castle is a popular destination for both locals and tourists.