Åland is a Swedish-speaking autonomous archipelago that happens to be Finnish territory and pay in euros. You do not fly into a big hub and rent a car at the belt; you step off a Viking Line, Tallink Silja, or Eckerö Line ferry in Mariehamn after a Baltic crossing from Stockholm, Kapellskär, Turku, or Helsinki, and the first language on the quay is Swedish.
The islands sit in a tax-free ferry quirk of EU law, which is why the ship shops feel like a duty-free corridor and why a .ax address on a cafe Wi-Fi login is not a typo. Rent a bike in Mariehamn, ride toward Kastelholm or the maritime museum, and eat Åland pancake with stewed plums — not cinnamon rolls you could have bought in Turku. Finnish works in offices; Swedish is what you use at the bakery.
There is no metro and no midnight coach network. Summer is archipelago boats and the Geta or Eckerö bus; winter is quieter, darker, and still on Finnish plugs and the 112 emergency number. A Finland-labelled eSIM is the plan to check, because Åland's towers talk to Finnish numbering (+358 18) more than to a Sweden-only package.