Yes, the Interrail Greek Islands Pass only offers ferry trips to enjoy island hopping on the Greek Islands. If you would like to travel by train in mainland Greece or any other countries you should combine the Greek Islands Pass with an additional Pass that is valid for those countries.

Yes, Greek ferries are a major component of the Interrail (and Eurail) experience, but they are generally included as a discounted benefit rather than a "free ride." Most Interrail pass holders receive a 30% discount on domestic routes operated by major lines like Blue Star Ferries and Superfast Ferries, covering popular destinations like Santorini, Mykonos, and Rhodes. To get this discount, you often have to have already completed an "Adriatic crossing" (e.g., from Italy to Greece) using a partner ferry line like Minoan or Grimaldi. For those with a "Global Pass," the Adriatic crossing itself—such as the route from Ancona or Venice to Patras—is often fully included, though you must still pay "mandatory surcharges" like port taxes, fuel surcharges, and seasonal fees (which can range from €10 to €30). In 2026, it is highly recommended to book these ferry segments in advance via the official ferry websites' "Interrail" partnership portals, as deck space and "airline-style" seats can sell out during the busy summer months.