One type of volcanic oceanic island is found in a volcanic island arc. These islands arise from volcanoes where the subduction of one plate under another is occurring. Examples are the Aleutian Islands, the Mariana Islands, and most of Tonga in the Pacific Ocean. The only examples in the Atlantic Ocean are some of the Lesser Antilles and the South Sandwich Islands.
Finland’s Archipelago Sea is the world’s largest, with 25,000 miles of shoreline and innumerable islands. Still off the beaten track for international tourists, who gravitate toward Helsinki in summer and Lapland in winter, the archipelago is the well-kept secret of the Finns, generations of whom flock to family-owned islands. And there’s never been a better time to join them, with increased airlift — including transatlantic flights on Norwegian Air starting around $350 — and a burgeoning food and beverage scene in nearby Turku, Finland’s medieval capital. (Start at the Kauppahalli, or market hall, where the salmon is as fresh and flavorful as a summer tomato.) The archipelago has a subarctic glamour, with eerie, sunlit summer nights and dark winter days, its rocky, tree-lined islands dotted with storybook wooden cottages. Hike, bike, or drive the islands; or hole up on one all your own. —Molly McArdle
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