Umihotaru is a unique artificial island located in the middle of the Tokyo Bay in Japan. It serves as a rest area and a service station for travelers using the Aqua-Line, a highway that connects Kawasaki and Kisarazu. The island features various amenities, including restaurants, shops, and observation decks that offer stunning views of the bay and surrounding areas. Constructed in 1997, Umihotaru is notable for its eco-friendly design and integration with the natural environment. It is also a popular spot for tourists and locals alike, providing a convenient place to relax and enjoy the scenery while traveling across the bay.