Almost all addresses are based on the grid system, with avenidas (Av) running in one direction (north to south) and calles east to west, often numbered. All addresses specify the street first, then the block, and end with the zone. For example, the address “Av la Reforma 3–55, Zona 10” means that house is on Avenida la Reforma, between 3 and 4 calles, at no. 55, in Zona 10. In Antigua calles and avenidas are also divided according to their direction from the central plaza – north, south, east or west (norte, sur, oriente and poniente). Diagonales (diagonals) are what you’d expect – a street that runs in an oblique direction.