Lauwersmeer

On 25 May 1969 the Lauwerszee stopped being sea. The estuary between Groningen and Friesland — tidal flats, channels, a shrimp fleet at Zoutkamp — was shut off from the Wadden by a dike at Lauwersoog, the delayed local instalment of the flood-defence reckoning after 1953. The salt drained out of the story slowly: the flats sweetened into fresh marsh, the channels became a shallow lake, and on the emptied seabed a landscape assembled itself that nobody had designed — sea buckthorn thickets, orchid fields on shell-rich sand, reedbeds by the square kilometre. Where the Netherlands' other new lands were parcelled into farms, most of the Lauwersmeer was simply left, first as military ground and rough grazing, then, from 2003, as a national park.

It became bird country of the first rank. The park holds breeding densities of bluethroat that draw birders from across Europe — a bird of thumbnail size and improbable sapphire that sings from every second reed-crowned ditch in April — plus bearded reedlings, marsh harriers as the default raptor, spoonbill flocks on the shallows and, since the 2010s, white-tailed eagles breeding: the reintroduced-nowhere, arrived-by-itself flagship whose two-and-a-half-metre span now patrols the lake daily. In autumn the numbers go continental, with tens of thousands of barnacle and white-fronted geese roosting on the water. Konik horses and Highland cattle do the mowing, half-feral herds that keep the old seabed open, and the one martial holdover — the Marnewaard army range in the northeast — closes its corner on firing days and incidentally guards the emptiest habitat.

The park's second superlative arrived in 2016, when it was certified a Dark Sky Park — among the first in the country, and still the darkest official sky on the Dutch mainland. It is a strange and excellent doubling: the place the state once closed against the sea now markets the Milky Way, with night-walk programmes from the visitor centre and an unlit core where October meteors fall over the geese roosts.

What's worth knowing before you go

Lauwersoog, on the dike itself, is the hub: the national park visitor centre, the ferry to Schiermonnikoog next door, and fish stalls run by the fleet that moved up from Zoutkamp when the sea did. Groningen and Leeuwarden are the rail approaches, each with a bus onward — and Zoutkamp itself, the stranded fishing village with its anchored lightship and shrimp sheds, is the essential cultural stop. Walk the Ballastplaat or Vlinderbalg routes for bluethroats in April–May (first hours of the morning; they sing themselves hoarse by ten), come in late October for geese at dusk and stars an hour later. Check Marnewaard closure notices before planning the northeast trails. The connoisseur's move is a new-moon night in autumn: park at the Suyderoogh side, walk out onto the open plain, and get the rarest Dutch experience of all — standing in the dark.