Guida
Sarushima is a deserted island located in Tokyo Bay, off the coast of Yokosuka City, Kanagawa Prefecture. Currently maintained by Yokosuka City as "Sarushima Park," it is a place where nature and history coexist. The island contains ruins of artillery batteries and fortresses built from the late Edo period to the Meiji era, and it is officially designated as a national historical site. It is also a popular leisure destination for walking tours and barbecues amidst a lush, natural environment.
The island has a deep historical background. Archaeological finds, such as pottery and human remains from the Jomon and Yayoi periods, indicate human presence since ancient times. It was once part of the grounds for Kasuga Shrine. In 1847, during the late Edo period, the first domestic battery was constructed by the Edo Shogunate. During the Meiji era, the island developed as a strategic fortress under the jurisdiction of the Imperial Japanese Army. The brick structures remaining on the island are precious artifacts demonstrating the engineering techniques of that era. Although the island was under U.S. administration following World War II, it is now preserved as a vital cultural heritage site that conveys Japan's history.
The most striking feature is the fortress ruins. The brick structures built into the rock walls showcase the rare "Flemish bond" masonry technique, which is uncommon in Japan. Additionally, the mysterious and historical landscape has attracted many tourists who associate the scenery with the atmosphere of the world of the famous anime film "Castle in the Sky." Well-maintained walking paths allow visitors to enjoy the scenery against the backdrop of the calm waters of Tokyo Bay.
Access to Sarushima is via boat from the Mikasa Terminal. The boat schedule varies by season, with a "Summer Schedule" from March to October and a "Winter Schedule" from November to the end of February. The boat ride takes approximately 10 minutes one way. Because the scenery changes with the seasons, a clear morning is an ideal time to observe the beautiful contrast between the historical ruins and the sea.
Various activities utilizing the natural environment are available on the island. Beyond simple strolls along the paths, visitors can enjoy barbecues on the sandy beaches (rental equipment is often available). Furthermore, "Exploration Tours" are held to provide a deeper understanding of the island's history and nature, with programs such as 30-minute and 60-minute courses. These offer a unique perspective that differs from standard sightseeing.
To reach Sarushima, take a boat from the Mikasa Terminal, which is about a 15-minute walk from "Yokosuka Chuo Station" on the Keikyu Line. The area around Mikasa Terminal is steeped in the history of Yokosuka, making it easy to plan a sightseeing itinerary around the boat departure times. The island is managed with a focus on nature conservation, ensuring a balance between tourism and environmental protection.
As the island contains unpaved paths and rocky areas, it is highly recommended to wear comfortable walking shoes (such as sneakers). Preparation for the boat ride and island activities is essential. Regarding payments, please check the availability of cash or credit cards in advance. While some English signage and information are available, please follow local rules and etiquette. To protect the environment, visitors are expected to carry their trash home and respect the natural surroundings.