An approved ETIAS for UK citizens allows the holder to visit any and all of the Schengen countries.
These countries consist of member states who signed the Schengen Agreement in Schengen, Luxembourg in 1985. This treaty allowed the countries to abolish passports and all other types of border control at their mutual borders.
The Schengen Area includes countries in the European Union including France, Germany, Spain, Greece, and Italy. 4-non EU countries also make up the Schengen Zone. These are Iceland, Liechtenstein, Norway, and Switzerland.
Additionally, there are several EU countries which have pending membership of the Schengen Area but have not yet fully met the acquis. These are Bulgaria, Croatia, the Republic of Cyprus, and Romania.
As of November 2023, it is also necessary to have an approved ETIAS for British citizens to visit these countries.
A full list of countries you can visit with a UK ETIAS, as well as an interactive map, can be found below.