Plavje (pronounced [ˈplaːu̯jɛ]; Italian: Plavia Monte d'Oro) is a village in the City Municipality of Koper in the Littoral region of Slovenia.

[2] 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.

After the Italian armistice in September 1943, it was occupied by Nazi German forces and included in the Operational Zone Adriatic Coast.

In early June 1945, the Yugoslav Army retreated east of the Morgan Line, and Plavje was occupied by British and American troops.

It remained under Anglo-American occupation until 1954, when it was ceded to the Socialist Federal Republic of Yugoslavia, thus cutting off its connections with the settlements of Muggia, Dolina and Trieste, which were left in Italy.

During the Ten-Day War of 1991, some intensive fighting took place close to the village, at the international border crossing between Rabuiese, Italy and Spodnje Škofije, Slovenia.