The main ports are those of Buenos Aires, Quequen and Bahia Blanca.

Ferry
There is a very well developed ferry service connecting Argentina and Uruguay, which offers trips to several cities within the latter. One of the largest and best known firms is the Buquebus Co, which offers trips to the Cities of Colonia and Montevideo, in Uruguay. Although this means of transportation is pretty expensive, it is also comfortable and fast.

Cities with fluvial transportation to Buenos Aires

City	Country	Time
Carmelo	Uruguay	03:00 hrs
Colonia	Uruguay	00:45 hrs
Montevideo	Uruguay	02:45 hrs
Piriápolis (available only in summer)	Uruguay	03:00 hrs