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> It was signed on 14 June 1985, near the town of Schengen, Luxembourg, by five of the ten member states of the then European Economic Community.

> Originally, the Schengen treaties and the rules adopted under them operated independently from the European Union. However, in 1999 they were incorporated into European Union law by the Amsterdam Treaty, while providing opt-outs for the only two EU member states that had remained outside the Area: Ireland and the United Kingdom (which subsequently withdrew from the EU in 2020). Schengen is now a core part of EU law, and all EU member states without an opt-out which have not already joined the Schengen Area are legally obliged to do so when technical requirements have been met. Several non-EU countries are included in the area through special association agreements.