Chuí is a municipality located in the state of Rio Grande do Sul, Brazil. It's the southernmost municipality of Brazil, located in the coordinates 33°41′0″S . A border town, it shares its name with sister city Chuy, Uruguay. The two towns constitute one contiguous urban area, divided by a border street called Avenida Internacional, a situation also seen in a few other Brazilian border points, such as between Santana do Livramento and Rivera.
Formerly a village under the jurisdiction of the municipality of Santa Vitória do Palmar, Chuí became the southernmost municipality in Brazil in 1997, when it seceded. It is very close to Brazil's southernmost point, located on a bend of the homonymous river just before its mouth on the Atlantic Ocean, near the hamlet of Barra do Chuí.
Wikipedia https://en.wikipedia.org/wiki/Chuí
Coordinates -33°41'22.286" N -53°27'16.935" E