The Tokyo Bay Aqua-Line is a unique transportation route in Japan that connects the city of Tokyo to Chiba Prefecture. It consists of a bridge and a tunnel, spanning approximately 15.1 miles (24.3 kilometers) across Tokyo Bay. The Aqua-Line significantly reduces travel time between the two regions, making it an essential route for commuters and travelers. Opened in 1997, the Aqua-Line features a bridge section that rises above the water and a submerged tunnel section that allows ships to pass overhead. Along the route, there are rest areas, including the Umihotaru service area, which offers stunning views of the bay and surrounding areas.