Colonia (shortname for Colonia del Sacramento) is one of the day trips you can do from Buenos Aires. This little colonial town is very peaceful and relaxing in contrast to the big imposing personality of Buenos Aires. If you cross the River to get there, read this article to know what’s best to do in Colonia. (if you want to know how to get to Colonia check this article)
Between Argentina and Uruguay, where two rivers join, Uruguay and Paraná, the delta of Río de la Plata is formed. Considered the widest river of the world with 219km, Río de la Plata divides both countries. On the map Río de la Plata looks like a wide mouth that opens to the sea, and on its coasts you will find Buenos Aires, Colonia and Montevideo.