Fort Santo António of Lifau
Oe-Cusse Ambeno, Timor-Leste
Fort Santo António de Lifau was a Portuguese fort once built by the mouth of the Tono River, in Lifau, district of Oecusse, in East-Timor, the first fort built by the Portuguese Crown, where only forts maintained by Dominican missionaries and Portuguese merchants previously existed.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).