Spartan City is a city in Italy in theYu-Gi-Oh! ZEXAL anime. Its name comes from Sparta, an ancient Greek city-state which was home to the legendary Spartan warriors, while its location and the presence of a Colosseum reference the similar culture of Rome.
Nistro and Dextra grew up as orphans in this city, with Duel Monsters being their only shred of hope. In search of a Mythyrian "Number", Yuma and his friends arrived in this city to learn of a Duel tournament that Nistro is participating in, with Dextra serving as his manager. There, they learned that a "Mythyrian Number" was hidden underneath a lake. The city also has a large arena, where the Pro Duelist Spartancity Tournament was held which concluded in Nistro's victory.