The clay underfoot was sea once. Tides moving in and out of the Wadden left fine sediments along this coast for millennia, and the early inhabitants discovered they could farm it - if they could keep the next storm from washing them away. The solution was the wierde: a hand-built mound of earth, raised high enough that a family, a few animals, and a small church could ride out the floods. Hundreds of these mounds still poke above the surrounding fields, each one crowned by a village. Eventually the dikes came, the marshes were drained into polders, and the wierden became unnecessary as flood refuges. But the villages stayed where they were, slightly elevated, as if standing on tiptoe to watch the sea.

At Pieterburen, on the northern edge of the region, a peculiar Dutch activity called wadlopen begins. Guides lead small groups out across the Wadden Sea floor at low tide, walking through ankle-deep mud and occasional thigh-deep channels toward the Frisian Islands offshore. The sea bottom revealed twice daily is a UNESCO World Heritage landscape - rippled silt, drifts of cockle shells, the occasional seal hauled out on a sandbar. The hike requires a guide because the tide returns fast and the channels shift, but for the experienced wadloper it is possible to walk all the way to Schiermonnikoog. Pieterburen is also where the Pieterpad starts, the most popular long-distance footpath in the country, running 500 kilometers south to Maastricht.

Dotted across the Hogeland are the borgen - fortified manor houses where Groningen's old landed families lived. Most were demolished in the nineteenth century when the rural gentry ran out of money or descendants. A handful survived. Menkemaborg in Uithuizen, with foundations going back to the fourteenth century, still has its moat, its formal garden, and a museum showing what daily life looked like for a wealthy farming family in the eighteenth century. The same village holds the Jacobikerk, whose Arp Schnitger organ from 1701 is considered one of the best-preserved baroque organs in Europe. Two centuries of Hogeland prosperity in one street.

For most of the twentieth century, the Hogeland was a patchwork of small municipalities - De Marne, Winsum, Eemsmond, Bedum, each with its own town hall and budget. In 2019 they were folded together into a single municipality called Het Hogeland, home to about 48,000 people. The merger was practical and slightly melancholy in the way Dutch consolidations tend to be: efficient on paper, but a quiet acknowledgment that the rural north no longer has the population to support a council in every market town. The villages remain. The borders just got redrawn.

Travel in the Hogeland still rewards patience. Two Arriva train lines run north from Groningen city - one to Roodeschool through Winsum, Baflo, Warffum, Usquert and Uithuizen, the other to Delfzijl through Bedum, Stedum and Loppersum. Both trains run twice an hour, and you can be in the middle of nowhere thirty minutes after leaving the city. Between villages, the cycling paths are dedicated and clearly signed, and the wind off the Wadden is usually doing half the work. From the port of Lauwersoog, the ferry departs four or five times a day for Schiermonnikoog. From Eemshaven, you can sail to the German island of Borkum. Either way, you end up on a flat horizon, with the sea quietly making more land.