Valmiki Ramayana 6.37.4

इयम् सा लक्ष्यते लन्का पुरी रावण पालिता ।सासुर उरग गन्धर्वैर् अमरैर् अपि दुर्जया॥

iyam sā lakṣyate lankā purī rāvaṇa pālitā |sāsura uraga gandharvair amarair api durjayā ||

Our plain-language meaning of this verse is waiting for scholar review.