Onaura Beach located in the west of Katsuura Bay in Matsube, Katsuura City, Chiba Pref. is a part of Minami-Boso Quasi-National Park. The huge rock called “Megane-iwa (eyeglasses rock)” or “Benten-iwa,” which was formed by long-term erosion and weathering, adds to the scenic attraction. The beach is popular as a quiet bathing spot and the rocky shore is a known good-out-of-the-way fishing spot. Along the coastline of Katsuura Bay, there are a lot of sightseeing spots including Ubara Risokyo ria coast, Katsuura Marine Park, which is the largest marine park in Asia, and Kushihama Bathing Beach. Visitors can enjoy various outdoor activities all through the year.