Plavje (pronounced [ˈplaːu̯jɛ]; Italian: Plavia Monte d'Oro) is a village in the City Municipality of Koper in the Littoral region of Slovenia. It is located on the northernmost edge of the Istrian peninsula, on the border with Italy, on a small hill overlooking the Gulf of Trieste.
It has a small border crossing with Italy, connecting it with the nearby village of Belpoggio in Noghere (Slovene: Beloglav), south of Trieste, which used to be a hamlet of Plavje (until 1954). Since Slovenia's accession to the European Union and the Schengen area, customs and immigration checks have been abolished at the Italian-Slovenian border.
Plavje is located on a small slope overlooking the Gulf of Trieste and Koper Bay. It is located on the border with Italy, which runs on the northern edge of the village. It has good road connections to Koper and Trieste because it is located above the highway connecting the two cities. It enjoys a mild climate, safe for the strong bora wind that frequently blows in the winter.