The city is centred around Plaza Independencia (Independence Plaza) with Avenida Sarmiento running through its centre east–west, with the east side pedestrianized (peatonal). Other major streets, running perpendicular to Sarmiento, include Bartolomé Mitre, San Martín, and 9 de Julio (July 9th), those running parallel include Colón, and Las Heras. Four smaller plazas, San Martín, Chile, Italia, and España, are located 2 blocks off each corner of Independence Plaza. Unique to Mendoza are the exposed stone ditches, essentially small canals, which run alongside many of the roads supplying water to the thousands of trees.