Eckerö sits on the western edge of the Åland Islands, facing Sweden across the Sea of Åland. For many visitors it is simply the ferry port from Grisslehamn, but it has enough history and summer atmosphere to justify slowing down before heading back to Mariehamn.
The old mail route is the key to the place. Before steamships and modern borders, mail between Stockholm and Turku crossed the open water here in small boats, often in rough weather. The grand Eckerö Mail and Customs House was built in 1828 after Finland became part of the Russian Empire, deliberately oversized to impress anyone arriving from Sweden.
Around Käringsund, Eckerö turns into a relaxed summer harbour with boathouses, small museums, guest boats, beaches, and family-friendly activities. The Åland Hunting and Fishing Museum gives the local coast some context, while boat trips to Märket Lighthouse reach one of the Baltic's stranger border places.