At a length of 164km, the Reuss, or Rüüs as the locals say (pronounced rooess), is Switzerland's fourth longest river. The course of the lower Reuss runs from Lake Lucerne. In recent years it has become a popular bathing spot where people float downstream with the current. You can enter the water at Kasernenplatz using the staircase right after the Spreuerbrücke and then float until you reach Reusszopf next to the nordpol Summer bar close to the town of Emmenbrücke. This route is over 2km long. It's good fun, but be careful, as the river can have strong currents. Only good swimmers should attempt this and it's best not to swim alone!