What makes the Hardangerfjord unusual among Norway's great fjords is its complexity. Rather than cutting a single clean line into the mountains, it splinters into a web of side fjords and arms that reach into every surrounding valley. Sørfjorden extends 50 kilometers south from the main channel. Eidfjorden pushes east toward the village of the same name. Osa Fjord branches north, then splits again into Ulvikafjorden. The whole system resembles a tree viewed from above, its trunk rooted in the Atlantic and its branches probing the highland plateau. At its deepest point, just outside the village of Norheimsund, the water drops more than 860 meters below the surface. Islands guard the western entrance -- Stord, Tysnesoya, and Varaldsoy on the north side, the Folgefonna glacier peninsula on the south -- before the mainland closes in and the branching begins.

The same waterfalls that drew Thomas Cook's tourists eventually attracted something less romantic: industry. By the late nineteenth century, engineers recognized that the cascades tumbling from the Hardangervidda plateau into the fjord represented enormous hydroelectric potential. One by one, the grand waterfalls that had filled Victorian sketchbooks were harnessed. Turbines replaced tourist viewpoints. The town of Odda, at the fjord's innermost reach, transformed from a scenic terminus into an industrial settlement powered by falling water. It was an exchange that played out across Norway -- scenery traded for electricity -- but few places felt the tension between beauty and utility as sharply as the Hardangerfjord, where the attractions that had created tourism became the infrastructure that threatened it.

Today the fjord's economy has found a different rhythm. Fish farms anchored in the sheltered side fjords produce more than 40,000 tons of salmon and rainbow trout each year, making the Hardangerfjord one of four major fish farming regions in the world. The conditions are nearly ideal: deep, cold, oxygen-rich water flowing in from the Atlantic, protected from the worst ocean swells by the islands at the fjord's mouth. Even the meltwater has been monetized -- glacial runoff from the surrounding mountains is bottled at source as Isklar and sold worldwide. Tourism, meanwhile, has returned. New infrastructure along the fjord has reopened communities to travelers, and the cycle that Thomas Cook started in the 1870s continues, though cruise ships have replaced paddle steamers and smartphones have replaced sketchbooks.

The Hardangerfjord exists because ice is patient. During the last glacial period, rivers of ice ground slowly seaward through the rock, scooping out a channel that eventually filled with Atlantic water as the glaciers retreated. The result is a landscape of almost theatrical drama: vertical rock walls plunging straight into water, hanging valleys where tributary glaciers once spilled over the main channel's edge, and side fjords that turn at sharp angles where the ice found weaker seams in the bedrock. The Hardangervidda plateau, Europe's largest mountain plateau, looms above it all, its flat expanse a stark contrast to the verticality below. On clear days the plateau's edge is visible from the fjord as a clean horizontal line drawn against the sky, as if someone had leveled the mountains with a straightedge.