With the Deutschlandticket you can not only travel on public transport within Germany, but also abroad. ICE, IC, and EC are excluded from the ticket offer and you still need a ticket for these trains.
The validity of the ticket is not always based on geographical limits, but primarily on tariff limits. Some of the German transport associations “protrude” into neighboring countries. This means you can easily travel to some train stations abroad with the 49 euro ticket. SÜDWEST24 reveals where you can go on vacation for just 49 euros: Denmark, Belgium, the Netherlands, Poland, France, Luxembourg and the Czech Republic are just some of the destinations you can reach with the ticket. The ticket is valid “throughout Germany on local transport and on all routes and to all train stations, which also include tickets from the Germany tariff and, in some cases, tickets from German Transport associations and state tariffs” The ticket also enables the use of bus connections to neighboring Dutch cities.