"All four European Free Trade Association (EFTA) member states – Iceland, Liechtenstein, Norway, and Switzerland – have signed agreements on association with th

"All four European Free Trade Association (EFTA) member states – Iceland, Liechtenstein, Norway, and Switzerland – have signed agreements on association with the Schengen Agreement, even though they are outside the EU" https://en.wikipedia.org/wiki/Schengen_Area https://en.wikipedia.org/wiki/Schengen_Area