Aqua-Line is a water transportation system designed to facilitate the movement of people and goods across bodies of water. It typically includes features such as ferries, boats, and docks, providing an efficient alternative to traditional road or rail transport. Aqua-Line systems can be found in various regions, often connecting islands or coastal areas to the mainland. The Aqua-Line concept can also refer to specific projects, such as the Tokyo Bay Aqua-Line in Japan, which combines a bridge and tunnel to link Kawasaki and Kisarazu. These systems aim to reduce travel time and enhance connectivity while promoting sustainable transportation options.