The Interrail Global Pass allows you to travel anywhere in the following countries (except your own country of residence):
Austria, Belgium, Bosnia-Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Great Britain, Hungary, Ireland (Republic of Ireland and Northern Ireland), Italy, Latvia, Lithuania, Luxembourg, Montenegro, the Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Switzerland, Sweden, and Turkey.
If you want to travel in only one country, you can also opt for an Interrail One Country Pass for the country of your choice