OET interlinear REV 17:18

uW Translation Notes:

Note 1 topic: figures-of-speech / metonymy

ἡ πόλις ἡ μεγάλη, ἡ ἔχουσα βασιλείαν ἐπὶ

the the city ¬the great ¬which having ˓a˒_kingdom (Some words not found in SR-GNT: Καί ἡ γυνή ἥν εἶδες ἐστίν ἡ πόλις ἡ μεγάλη ἡ ἔχουσα βασιλείαν ἐπί τῶν βασιλέων τῆς γῆς)

The angel is referring to the king who rules from the great city by association with that city itself. If it would be helpful in your language, you could use an equivalent expression or express the meaning plainly. Alternate translation: [the great city whose king has a kingdom over]

Note 2 topic: figures-of-speech / abstractnouns

ἡ πόλις ἡ μεγάλη, ἡ ἔχουσα βασιλείαν ἐπὶ

the the city ¬the great ¬which having ˓a˒_kingdom (Some words not found in SR-GNT: Καί ἡ γυνή ἥν εἶδες ἐστίν ἡ πόλις ἡ μεγάλη ἡ ἔχουσα βασιλείαν ἐπί τῶν βασιλέων τῆς γῆς)

If your language does not use an abstract noun for the idea of kingdom, you could express the same idea in another way. Alternate translation: [the great city that rules over] or [the great city whose king rules over]