Paderna

Villaromagnano is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 25 kilometres (16 mi) southeast of Alessandria. Villaromagnano borders the following municipalities: Carbonara Scrivia, Cerreto Grue, Costa Vescovato, Paderna, Sarezzano, Spineto Scrivia, and Tortona.

Carezzano is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 25 kilometres (16 mi) southeast of Alessandria. As of 31 December 2004, it had a population of 429 and an area of 10.3 square kilometres (4.0 sq mi). Carezzano borders the following municipalities: Cassano Spinola, Castellania Coppi, Costa Vescovato, Paderna, Sant'Agata Fossili, Tortona, and Villalvernia.

Villalvernia is a comune, population 932, in the Province of Alessandria in Piedmont, Italy, situated in a hilly area on the right bank of the Scrivia.

Castellania Coppi is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 30 kilometres (19 mi) southeast of Alessandria. It was known until 2019 as Castellania, and renamed by the Piemont regional council in recognition of the cyclist Fausto Coppi in preparation for the centenary of his birth.Castellania Coppi borders the following municipalities: Avolasca, Carezzano, Costa Vescovato, Garbagna, Sant'Agata Fossili, and Sardigliano.

Cerreto Grue is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) east of Turin and about 25 kilometres (16 mi) southeast of Alessandria. As of 31 December 2004, it had a population of 346 and an area of 4.8 square kilometres (1.9 sq mi).Cerreto Grue borders the following municipalities: Costa Vescovato, Montegioco, Sarezzano, and Villaromagnano.

Sant'Agata Fossili is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 30 kilometres (19 mi) southeast of Alessandria. As of 31 December 2004, it had a population of 425 and an area of 8.0 square kilometres (3.1 sq mi). Sant'Agata Fossili borders the following municipalities: Carezzano, Cassano Spinola, Castellania Coppi, Sardigliano.

Sarezzano (Western Lombard: Sarsòu) is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) east of Turin and about 25 kilometres (16 mi) east of Alessandria. As of 31 December 2004, it had a population of 1,171 and an area of 13.8 square kilometres (5.3 sq mi).The municipality of Sarezzano contains the frazioni (subdivisions, mainly villages and hamlets) Baracca, Cucco, Palazzina, Rocca Grue, San Ruffino, and Sant'Innocenzo. Sarezzano borders the following municipalities: Berzano di Tortona, Cerreto Grue, Monleale, Montegioco, Tortona, Viguzzolo, and Villaromagnano.

Avolasca is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 30 kilometres (19 mi) southeast of Alessandria. Avolasca borders the following municipalities: Casasco, Castellania Coppi, Costa Vescovato, Garbagna, Montegioco, and Montemarzino.

Sardigliano is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 30 kilometres (19 mi) southeast of Alessandria. Sardigliano borders the following municipalities: Borghetto di Borbera, Cassano Spinola, Castellania Coppi, Garbagna, Sant'Agata Fossili, and Stazzano.

Cassano Spinola is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 25 kilometres (16 mi) southeast of Alessandria. Cassano Spinola borders the following municipalities: Carezzano, Novi Ligure, Pozzolo Formigaro, Sant'Agata Fossili, Sardigliano, Serravalle Scrivia, Stazzano, and Villalvernia.

Tortona (Italian: [torˈtoːna]; Piedmontese: Torton-a [tʊrˈtʊŋa], locally [tʊrˈtɔŋa]; Latin: Dhertona) is a comune of Piemonte, in the Province of Alessandria, Italy. Tortona is sited on the right bank of the Scrivia between the plain of Marengo and the foothills of the Ligurian Apennines. Its frazione of Vho is one of I Borghi più belli d'Italia ("The most beautiful villages of Italy").

The siege of Tortona in 1155 was the first major military engagement resulting from Holy Roman Emperor Frederick Barbarossa's ambition to enforce Imperial hegemony in Italy.