In 19th century, Viale Regina Margherita was a tree-lined avenue that led from the neighborhood of the San Lorenzo district to the fields of Monti Parioli. The territory of the quarter includes the urban zones 2A "Villaggio Olimpico" and 2B "Parioli". Northward, the "quartiere" borders with "Quartiere" Tor di Quinto (Q. XVIII), separated from Parioli by the stretch of the Tiber between Ponte Milvio and the river Aniene, and with "Zona" Val Melaina (Z. I), whose border is defined by the stretch of the river Aniene between its immission in the Tiber and Ponte Salario. To the east, Parioli borders with "Quartiere" Trieste (Q. XVII), the boundary being marked by Via Salaria, between Ponte Salario and Viale Liegi. Southward, it borders with "Quartiere" Salario (Q. IV), whose border is marked by Viale Liegi and with "Quartiere" Pinciano (Q. III): it is separated from Parioli by Viale dei Parioli and by Viale Maresciallo Pilsudski, all the way to Via Flaminia. Westward, the "quartiere" borders with "Quartiere" Flaminio (Q. I), the boundary being the stretch of Via Flaminia between Viale Maresciallo Pilsudski and Piazza Cardinal Consalvi. Main roads in the area are:   Other roads and squares of the district are chiefly named after nations and cities. Odonyms of Parioli can be categorized as follows: