Haparanda skärgård

At the very top of the Baltic, hard against the Finnish border, Haparanda skärgård is an archipelago still in the act of being born. The land here, freed of the ice sheet's weight, is rising out of the sea at almost a centimetre a year — among the fastest uplift anywhere — and the park's low, sandy islands are the visible result: shorelines that creep outward within a human lifetime, boat channels that shoal and close, meadows standing where a grandparent moored a boat. Nowhere else in the park system is geology this quick.

The islands themselves are un-Baltic in texture: not skerries of bare rock but ridges of sand and moraine, with long shallow beaches, dunes and pine heath. Sandskär, the main island, carries the human story — a seasonal fishing hamlet used by Tornedalen fishermen since the sixteenth century, with its cabins and a small chapel still standing above the shore. The surrounding water is the Bothnian Bay at its most extreme, so diluted by the great northern rivers that it is nearly fresh: whitefish and other freshwater species swim around islands that smell of the sea.

The park, established in 1995, is above all a bird place — terns, waders and waterfowl breed on the open shores, and the shallow flats fill up on migration — and a midnight-sun place, this being about as far north as the Baltic reaches.

What's worth knowing before you go

Access is by boat from Haparanda, with tour departures to Sandskär in high summer and charters otherwise; approaches are shallow and shifting, which is exactly the park's point but demands local knowledge from anyone sailing themselves. Sandskär has simple cabins, a sauna and shelter for overnighting, and nothing commercial at all. July and early August are the season; bring mosquito defence and wind layers both, because the Bay supplies each without warning.

The connoisseur's detail is the uplift made concrete: on Sandskär, notice how the fishing hamlet stands oddly far from today's waterline. It was built by the shore. The shore left.