Bondhusvatnet, the glacier-fed lake cradled in Bondhusdalen Valley, owes its unnatural turquoise hue to rock flour—pulverized granite suspended in meltwater from the Bondhus Glacier tongue, a remnant of the 220-square-kilometre Folgefonna ice plateau.
The valley's U-shaped profile, carved during the last glacial maximum 20,000 years ago, funnels hikers along a four-kilometre trail that climbs 300 vertical metres from the parking area to the lake shore, passing through sub-alpine birch forest and over glacially polished bedrock. The lake itself sits at 550 metres elevation, its turquoise colour most vivid under midday sun when suspended silt refracts short-wavelength light.
Folgefonna National Park, established in 2005, protects 545 square kilometres of plateau glacier, outlet valleys, and the waterfalls that tumble from ice tongues into fjord-facing ravines. Bondhus Glacier Lake tour packages from Bergen—typically eight to ten hours round-trip—cross the Hardangerfjord by ferry and ascend the narrow switchback road into Bondhusdalen, a route engineered in the 1970s to serve the handful of farms at the valley mouth. The glacier tongue has retreated 400 metres since 1950, leaving a terminal moraine that now partially dams the lake; botanists document pioneer vegetation colonizing the exposed till.
The trail to the lake, maintained by the Norwegian Trekking Association, follows the old farm track used by valley residents until the road arrived. Wooden footbridges span meltwater streams swollen by afternoon sun. At the lake's western end, a viewing platform overlooks the ice cliff where the glacier calves small bergs into the water—a process accelerated by summer temperatures that now regularly exceed 20°C at valley level. The bedrock exposed by ice retreat reveals striations aligned southwest-northeast, recording the direction of ice flow during the Pleistocene.
Visitors arriving between June and September encounter the valley's brief growing season, when alpine wildflowers—Saxifraga oppositifolia, Silene acaulis—bloom on thin soils above the tree line. The lake's outflow, Bondhuselva, descends eight kilometres to Maurangerfjorden, dropping through a series of waterfalls that supplied hydroelectric power to valley farms before grid connection. Folgefonna's ice cap, one of Norway's southernmost glaciers, has lost 15 percent of its volume since 1960, a retreat documented by repeat photography from fixed survey points along the trail.
10 hr 30 min
