AcuaExpreso is a ferry service between the municipalities of Cataño and San Juan across San Juan Bay in northeastern Puerto Rico. It consists of one route connecting Cataño and the Old San Juan historic quarter in San Juan Islet via the Cataño Ferry, which docks at the AcuaExpreso Cataño Terminal in Cataño on the southwestern side of San Juan Bay and at the AcuaExpreso San Juan Terminal in Pier 2 of the San Juan Cruise Port in Old San Juan on the northeastern side of the Bay.