European Union shares border with Vatican City
Schengen Area
The Schengen Area is an area comprising 27 European countries that have officially abolished all passport and all other types of border control at their mutual borders. Being an element within the wider area of freedom, security and justice policy of the EU, it mostly functions as a single jurisdiction under a common visa policy for international travel purposes. The area is named after the 1985 Schengen Agreement and the 1990 Schengen Convention, both signed in Schengen, Luxembourg. Of the 27 EU member states, 23 participate in the Schengen Area. Of the four EU members that are not part of the Schengen Area, three—Bulgaria, Cyprus, and Romania—are legally obligated to join the area in the future; Ireland maintains an opt-out, and instead operates its own visa policy. The four European Free Trade Association (EFTA) member states, Iceland, Liechtenstein, Norway, and Switzerland, are not members of the EU, but have signed agreements in association with the Schengen Agreement. Also, three European microstates—Monaco, San Marino, and the Vatican City—maintain open borders for passenger traffic with their neighbours, and are therefore considered de facto members of the Schengen Area due to the practical impossibility of travelling to or from them without transiting through at least one Schengen member country.
adjoins borders neighbors is adjacent to