After the Jungfrau Marathon: Lake Brienz

The Route: Interlaken → Lake Brienz boat → Brienz or Iseltwald → Interlaken Logistics: BLS boats depart from Interlaken Ost; the full round trip can be done entirely by boat, or combined with a short train return. Marathon Month: September Duration: Day trip

Interlaken Ost ──(boat, ~1-2 hrs)──> Brienz / Iseltwald ──(boat or train return)──> Interlaken

Jungfrau-Marathon climbs 1,953 metres from Interlaken to Eigergletscher, and after that kind of day, the appeal of a mode of transport that involves no walking whatsoever is fairly direct. Lake Brienz, the turquoise lake the course itself briefly follows between roughly km 5 and km 10, rewards a proper look from the water rather than the fleeting glimpse race day allows. Early September on the lake is generally settled, though mountain weather can turn quickly even down at valley level, and boat schedules thin out as the season moves toward autumn, so checking the current timetable before planning around a specific departure matters here more than at a year-round transport link.

The Lake

Lake Brienz's colour, a genuine turquoise rather than a marketing description, comes from glacial rock flour suspended in the water, sediment ground down by the glaciers feeding the rivers that run into it, including the same meltwater systems the marathon course climbs toward. The lake is long and narrow, hemmed in by steep, forested slopes that drop almost straight into the water, giving the boat trip a sense of scale that's harder to appreciate on foot.

The boat itself is the primary recovery asset here: fully seated, with outdoor deck space for anyone wanting the air and mountain views, and indoor cabins for anyone whose legs and general constitution prefer to sit somewhere they can't feel the boat move as much. A full round trip from Interlaken Ost, calling at villages including Iseltwald and Brienz, takes one to two hours depending on the route chosen and how many stops are included.

Iseltwald, a small village on a headland jutting into the lake, makes a pleasant stop for anyone wanting a short walk without much gradient, its waterfront church and narrow lanes covered easily at a slow pace. Brienz itself, at the lake's eastern end, is known for woodcarving workshops and gives a slightly larger town to explore if a longer stop appeals, with a direct train connection back to Interlaken if the return boat schedule doesn't line up.

Return to Interlaken is straightforward either by boat or by train from Brienz, both running regularly through the day in September, though checking the specific afternoon timetable is worth doing before committing to a late departure.