Vallisaari Island

Vallisaari is a former military island about 5 km south-east of Helsinki Market Square in Uusimaa, Finland, opened to the public in 2016. It offers forest trails, fortress tunnels, a wild meadow landscape and the neighbouring island of Kuninkaansaari, linked by a stone causeway. The trip takes about 20 minutes by boat, with 3-4 hours spent on the island. The JT-Line seasonal ferry leaves from the Kolera Basin pier by Market Square; the 2026 season ran from 20 May to 12 September, with a listed adult return fare of EUR 9.80. The ferry is not covered by HSL tickets. The season has ended for 2026 and there is no service in October, so the island is closed to ordinary visitors until May 2027. A typical day starts with a morning ferry, followed by a walk along the island paths through forest and open meadow. Visitors can explore the old fortress tunnels and defensive structures, then cross the causeway to Kuninkaansaari for a different stretch of shoreline. Facilities on the island are limited, so a packed lunch and water are advisable; a picnic spot by the sea is a natural midday stop. In the afternoon, return along the trails and catch a late ferry back to Market Square. June to August is the best season, with long days and open meadows in flower; because the island was long closed to the public, it retains a wild and uncrowded feel. Wear sturdy shoes, bring layers for sea wind, and stay on marked paths, since the island is a protected area with unexploded-ordnance history that visitors should treat seriously by following posted rules. Check the ferry timetable before planning and confirm the 2027 season dates.