Refers to a mixed language which is spoken in the border between Uruguay and Brazil, notably in the region of the twin cities of Rivera and Santana do Livramento, where the border is open and a street is the only line dividing the two countries. This condition, over hundreds of years, gave rise to a new language, which their speakers call portuñol/portunhol, brazilero, or fronterizo/fronteiriço. It has been studied extensively by linguists.
