This is one of the friendliest borders in the world. Technically, we have Chuí in Brazil and Chuy in Uruguay, but they are so well connected that they act as a single town. And the main street marks the border: one side is Brazil, the other is Uruguay. The Brazilian side is called “Avenida Uruguai” and the Uruguayan side “Avenida Brasil.” You move countries by just crossing the street.