Armação dos Búzios , or just Búzios , as it is popularly known, is a municipality in the Lakes Region in the state of Rio de Janeiro , Brazil. It is a peninsula with eight kilometers long and 23 beaches , getting a sea side chains of Ecuador and other ocean currents from the south pole , which means it has both beaches as warm waters of the icy waters . Among the main beaches stand out Geribá Tucun , John Fernandes , Horseshoe, Ferradurinha Frame , Manguinhos Turtle Bones , Brava and Ox -Eye , the latter reserved for naturism . The average annual temperature is 24 ° C and has the lowest rainfall in the state of Rio de Janeiro index : about 750 mm per year only .