Lake Brienz holds its turquoise glow through winter, fed by glacial meltwater that suspends rock flour in suspension year-round. The Brienzersee stretches fourteen kilometres between Interlaken and the village of Brienz, flanked by the Brienzer Rothorn to the north and the Faulhorn massif to the south. Water temperature hovers near four degrees Celsius in January, yet guided winter kayak tours have operated from Bönigen since the mid-2010s, capitalising on stable weather windows and the lake's relative shelter from Alpine storms. Winter paddling on Lake Brienz offers visibility that summer crowds obscure. Tour operators launch from the Bönigen waterfront, a kilometre west of Interlaken Ost, where the lake narrows and morning light strikes the Giessbach Falls across the water. The falls freeze partially in hard winters, their seventeen cascades reduced to ice columns that catch midday sun. Kayakers follow the northern shoreline toward Iseltwald, passing beneath cliffs that rise three hundred metres and shed ice into the shallows. Snow cover on surrounding peaks — the Schwarzhorn, the Sigriswilergrat — reflects onto the water's surface, amplifying the blue-green hue that distinguishes Brienz from neighbouring Thun. The lake's winter kayaking season runs from December through March, when low tourist traffic and crystalline air create conditions unattainable in warmer months. Paddlers wear drysuits provided by outfitters, and tours depart only when wind speeds remain below fifteen kilometres per hour. The Brienzersee sits at 564 metres elevation, high enough to hold Alpine character but low enough to avoid the avalanche risk that closes higher-altitude lakes. Historical records show the lake frozen solid just twice in the past century — 1929 and 1963 — a rarity that allows winter navigation. Guided winter kayak tour Lake Brienz experiences typically last two to three hours and include thermal layering instruction, paddle technique coaching, and commentary on the lake's geology. The glacial flour originates in the Aare Glacier system, travelling through the Reichenbach and Giessbach streams before entering the lake. This sediment gives Brienz its colour but also its clarity; the flour particles are too fine to cloud the water, allowing visibility to five metres even in winter. Tour groups rarely exceed eight participants, and departure schedules align with weather forecasts issued by MeteoSwiss. The combination of winter kayak tour Lake Brienz tours and the lake's geological singularity has made Bönigen a hub for cold-weather paddling in the Bernese Oberland, attracting visitors who seek alpine conditions without high-altitude exposure.