The Nordfjord area of western Norway hosts one of the best known provinces of ultrahigh-pressure (UHP) rocks in the world, yet the nature of the transition from the UHP rocks into surrounding amphibolite-facies crust has remained unclear. New thermobarometry of phengite- and kyanite-bearing eclogites shows that this transition is unbroken by major structures: the pressure and temperature gradient increases smoothly over a horizontal distance of ~20 km, from high-pressure amphibolite facies (~1.5 GPa/600--700¿C) through quartz eclogite (~2.4 GPa/600¿C) into UHP eclogite (>2.7 GPa/700¿C). These data support a model in which the Norwegian UHP province remained attached to lower pressure crust during exhumation. This requires that a large area of the Western Gneiss Region was metamorphosed and exhumed ~60 km through the mantle, as a relatively coherent body.