Why does Perú have that accent?

It means that when you say the word "Perú", you say it "perOO". The loudest (stressed) bit of the word is the "OO". It's the same with other words you'll find on these pages like 'Sechín'. You say that "setch-EEN". Get it? Normally, Spanish words have the stress on the last but one part of the word. Here's some examples: Urubamba is "oorooBAMba"; Lima is "LEEma"; Perene is "pehRENeh".

Pronouncing Spanish words is easy because a, e, i, o and u are always the same: