Aoshima's Devil's Washboard is a unique geological formation located on Aoshima Island in Japan. This natural phenomenon features a series of wave-cut terraces that resemble a giant washboard, created by the erosion of limestone over thousands of years. The formation is a popular spot for tourists and photographers due to its striking appearance and scenic coastal views. The Devil's Washboard is part of the Kirishima-Kinkowan National Park and is accessible via a short walk from the island's main attractions. Visitors can enjoy the beautiful ocean scenery and explore the surrounding area, which is rich in marine life and offers opportunities for various outdoor activities.