Rostov-on-Don vs Boulogne-Billancourt

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Rostov-on-Don (Russian: Ростов-на-Дону, tr. Rostov-na-Donu, IPA: [rɐˈstof nə dɐˈnu]) is a port city and the administrative centre of Rostov Oblast and the Southern Federal District of Russia. It lies in the southeastern part of the East European Plain on the Don River, 32 kilometers (20 mi) from the Sea of Azov, north of the North Caucasus.

The southwestern suburbs of the city abut the Don River delta. The population is over one million people (1,125,000). Rostov was one of the host cities of the 2018 FIFA World Cup.

Source: Wikipedia

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Boulogne-Billancourt (French pronunciation: ​[bulɔɲ bijɑ̃kuʁ]; often colloquially called simply Boulogne, until 1924 Boulogne-sur-Seine) is a commune in the western suburbs, and 8 km (5 mi) from the centre, of the French capital Paris.

Boulogne-Billancourt is a subprefecture of the Hauts-de-Seine department and the seat of the Arrondissement of Boulogne-Billancourt.

Source: Wikipedia