Like most Argentine cities, San Juan’s grid pattern makes orientation very easy; the addition of cardinal points – norte (north), sur (south), este (east) and oeste (west) – to street addresses helps even more. East–west Av San Martín and north–south Calle Mendoza divide the city into these quadrants. The functional center of town is south of Av San Martín, often referred to as Av Libertador; Plaza 25 de Mayo is the city's heart.