The swimming club that I'm a member of organized a tour last Sunday in which they swam around the Singel (which is Dutch for a round canal encircling a city).<p>With 5.8km it was quite a swim for the attendants.<p>EDIT: Translated Wikipedia page of 'Singel': <a href="https://translate.google.com/translate?hl=&sl=auto&tl=en&u=https%3A%2F%2Fnl.wikipedia.org%2Fwiki%2FSingel_(gracht)" rel="nofollow">https://translate.google.com/translate?hl=&sl=auto&tl=en&u=h...</a>