Schleswig-Holsteinisches Wattenmeer
Germany's largest national park — Halligen riding out the storm floods, a porpoise sanctuary off Sylt, and tidal flats running to the horizon.
Declared in 1985 and enlarged in 1999, the Schleswig-Holstein Wadden Sea is Germany's largest national park by an enormous margin — some 4,400 square kilometres of flats, sandbanks, salt marsh, and shallow sea between the Danish border and the Elbe estuary. Almost none of it is dry land in any committed sense. This is the drowned medieval coastline of North Frisia, where storm floods like the "Grote Mandränke" of 1362 swallowed whole districts; what remains above water are the islands, the sands, and the Halligen — ten low marsh islets whose farms stand on artificial mounds, accepting several "Land unter" floods a year as the price of the address. The inhabited Halligen themselves sit just outside the boundary, but the park surrounds them like weather.
The scale is best understood from a tide table: at low water the sea withdraws kilometres, and the park becomes a temporary continent of ribbed sand and mud worked by hundreds of thousands of birds — knots, dunlin, and oystercatchers in murmurating clouds, brent geese grazing the Hallig meadows each spring, shelduck moulting in the shallows. Seals pup on the outer sands, and west of Sylt and Amrum the 1999 enlargement added a designated whale sanctuary for the harbour porpoises that calve in the surf zone. Trischen, the shifting marsh island off the Dithmarschen coast, admits one person at a time: the bird warden, for the season. Since 2009 the whole system has been UNESCO World Heritage.
The human coast keeps its counterpoint everywhere in view — the striped Westerhever lighthouse on its mound, shrimp cutters working the channels, and the eternal Frisian arithmetic of dikes, groynes, and salt-marsh accretion fields.
What's worth knowing before you go
Husum and Tönning are the natural bases (both on rail), and Tönning's Multimar Wattforum is the park's flagship centre, aquaria included. Hallig ferries sail from Schlüttsiel and Nordstrand — Hooge and Langeneß make easy day trips — while Büsum and St. Peter-Ording serve the southern and seaward moods. Guided barefoot walks across the flats are the core experience; the Westerhever crossing at sunset is the postcard, and no crossing should ever be improvised against the tide.
Come in late April for the Ringelganstage, Hallig Hooge's brent-goose festival, or in high summer for porpoise-watching from Sylt's western beaches. The connoisseur's booking is a Hallig overnight around a forecast spring tide in the shoulder season — watching the sea take the meadows up to the mound's edge, and give them back by morning, is the park's whole story in one night.