The district's coat of arms is the easiest place to start. A golden lion rampant on a blue field, two Greek crosses above. The lion is older than the district - it was the badge of the chieftains of Jever, the family that pulled this corner of the Frisian coast out from under everyone else's claims in the early 15th century. When the Lordship of Jever was founded in 1359, it set itself in deliberate opposition to East Frisia next door. Two skirmishing minor states sharing a wet, dyke-laced coastline does not produce neighbours; it produces an inherited grievance, passed down through the chieftains' line until a woman named Maria of Jever became the last ruler and died, unmarried, in 1575.

Most German districts have a tidy history of belonging to one duchy or kingdom or another. Friesland's history reads like a leasing agreement gone mad. After Maria's death in 1575 the territory passed to Oldenburg - except East Frisia kept claiming it and blockading the roads for the better part of a century. From 1667 to 1793 the place was an exclave of Anhalt-Zerbst, a Saxon principality four hundred kilometres away. Then the Napoleonic Wars came and went, and for two decades Jever was the westernmost outpost of the Kingdom of Prussia. In 1818 it slid back into Oldenburg. Each owner left a layer of administration, a layer of dialect, a layer of grievance against the East Frisians, and a deepening conviction that whatever this place was, it was certainly not East Frisia.

The modern Landkreis was assembled in 1933 by stapling together the older districts of Jever and Varel under the name Friesland. In 1977 a reforming Land government dissolved it and split the territory between the larger districts of Wittmund and Ammerland - a tidy administrative simplification that lasted exactly two years. In 1979 the German constitutional court declared the dissolution unconstitutional because it violated rights inherited from the former state of Oldenburg. The district was reinstated in 1980 along its original lines. Few European districts get to claim a literal constitutional resurrection. Friesland does, which only deepens the local conviction that the place is sovereign in some way no map will quite admit.

The eastern boundary is the Jade Bight, a shallow ear-shaped bay carved out of the North Sea coast. The city of Wilhelmshaven sits on its western rim - completely surrounded by the district but legally independent of it, a doughnut hole inside the doughnut. Out beyond the dyke line, the island of Wangerooge - last of the East Frisian Islands going east - is administratively part of Friesland. Much of the district lies inside the Lower Saxony Wadden Sea National Park, a UNESCO-listed tidal flat where harbour seals haul out and migrating bird flocks darken the autumn sky. The land itself is dead flat, criss-crossed with drainage channels called tiefs and farmed for centuries by families who learned to read the weather off the colour of the water.

There is something stubborn and slightly comic about a district insisting on its own difference while sharing a language, a religion, a dyke system and a beer with the neighbours it disowns. But the people of Friesland have held this distinction for so long that it has become its own kind of truth. The Frisian region was independent from 1359 to 1575. That memory is fed by a coat of arms, a county-court ruling, a confederation of Sielhafen ports along the coast, and the simple stubbornness of marsh-country farmers who learned long ago that the people who give up their distinctions are the people who get absorbed. Out here, on the cold edge of the Bight, distinction is what keeps you on the map.