Germany, Austria, Belgium, Croatia, the Czech Republic, Denmark, Estonia, Finland, France ... Sweden and Switzerland have all acceded to the Schengen Agreement and are thus Schengen states.

and Switzerland - and 23 of the 27 European Union member states comprise the Schengen area. The 23 EU member states are Austria, Belgium, Croatia, the Czech Republic, Denmark, Estonia, Finland ...

In case you didn't know, the Schengen area covers 26 countries without border controls between them. These countries are ...

A Schengen visa is an authorisation issued by a Schengen state that allows travellers to enter the Schengen area for: intended short stays in or transit through the territory of a Schengen state ...