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The 1985 Schengen Agreement is an agreement among European states which allows for the abolition of systematic border controls between the participating countries. It also includes provisions on common policy on the temporary entry of persons, the harmonisation of external border controls and cross-border police co-operation. A total of 30 countries – including all European Union states and three non-EU members Iceland, Norway, and Switzerland – have signed the agreement and 26 have implemented it so far. The Republic of Ireland and the United Kingdom only take part in the police co-operation measures and not the common border control and visa provisions. Border posts and checks have been removed between Schengen countries and a common 'Schengen visa' allows tourist or visitor access to the area.
The agreement was originally signed on 14 June 1985, by five European countries (Belgium, France, Germany, Luxembourg, and the Netherlands). It was signed aboard the ship Princesse Marie-Astrid on the Moselle River, near Schengen, a small town in Luxembourg on the border with France and Germany.