01 How it actually works
The procedure is always the same and allows no improvisation. You walk upstream along the bank —typically from the Marzili quarter toward Eichholz— leave your clothes at a known point, get into the water and the current brings you back. You do not swim against it: you cannot.
The riverside bathing areas —Eichholz, Marzili and Lorraine— are free and work as the city's great recreation space. They are not tourist facilities: they are ordinary urban amenities, of the same kind as a park, and in summer they are full of people who live here.
02 Why that sign exists
On the bank, shortly before the end of the bathing area, there is a blue traffic-style sign with text in German, French and English: "Letzter Ausstieg / Dernière sortie / Last exit", and beneath it a distance. One hundred and forty metres. It is exactly what it looks like: notice that beyond this point there is nowhere to get out.
That sign is the best summary of the activity you will find anywhere. It turns a swim into something with the logic of a motorway: there is one lane, one direction and numbered exits. If you miss the last one, the river carries on, and carries on fast, toward stretches where the banks are walls with no ladder and no ramp.
It turns a swim into something with the logic of a motorway: one lane, one direction and exits.
03 What the river carries
The second local rule is just as blunt: never after heavy rain or with the river running high. The Aare drains an entire Alpine catchment and rises fast, and when it rises it does not just run faster: it runs loaded. The image below explains it better than any warning.
There is also a third variable, temperature, and it too has a number. The river runs at 2 to 5 degrees in winter and 18 to 22 in summer; the benchmark people here use for a comfortable swim is 18 degrees, and below 16 it simply is not a plan. Before heading down, the local habit is to check the live reading for temperature and flow.
04 How to do it properly
The first time, do not do it alone and do not improvise: get in where everyone gets in, at one of the marked bathing areas, and do a short stretch before considering a long one. Locate the exits before entering the water, counting from where you get in: once in the river, with the current on you, there is no time to look for them.
And one last thing, which changes the visit most even if you do not swim. Even if you decide to stay on the bank, walk the stretch between Eichholz and Marzili on the riverside path. It is a flat half-hour walk that shows you the city from below —the natural wall of the slope, the high bridges, the Matte quarter at water level— and explains once and for all why this city is built where it is.
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