If There is not any bus station inside of a town, there may be some type of public transportation (a bus, possibly) to the bus station of a city nearby. When you are crossing a land border and intend to return to Brazil (e.g. after a day excursion to Paraguay https://brandwoot.com/profile.php?action=view&op=userinfo&userinfo=humberto.buteau.451692&name=Your_Account&do=profile