It is the largest uninhabited island with natural forest in Tokyo Bay. It has a long history, and stone tools and earthenware from the Jomon and Yayoi periods have also been discovered. Sarushima spent a quiet time for a while, but at the end of the Tokugawa shogunate, it took on the role of Daiba to defend Edo Bay. In the Meiji era, it was maintained as a Western-style battery and protected Tokyo Bay. After World War II, Sarushima returned to silence. As a result, Odaiba and fortress-era buildings have become a valuable historical heritage. The nature revived in the tranquility also gives visitors the enjoyment of each season. The beach is open from July to August. You can barbecue on the sandy beach throughout the year. Sarushima Park is a natural island that conveys legends and history. Sarushima has been designated as a national historic site, and has also been designated as a Japanese heritage site as one of the constituent cultural properties of "a town where you can experience the dynamics of modernization of Japan." (15 minutes walk from Keikyu Yokosuka Chuo Station, 10 minutes boarding from Mikasa Pier)