Universiteit Leiden

Canal Watch (De Gracht­wacht)

Canal Watch (De Gracht­wacht)

Contribution: Liselotte Rambonnet (biologist) and Auke-Florian Hiemstra (biologist)

Leiden has 28 kilometres of canals, but sail along them and you’ll soon have collected 15 bin bags of litter. Volunteers use De Grachtwacht’s fleet of canoes to clean the canals every Sunday and we use these same canoes for research and tackling litter at the source. You’ll the most unusual finds in our canal museum on Mare Bridge. We now use deposit cups in Leiden, have plastic-free pavement cafés and are gathering new knowledge on urban waste. It’s fantastic that Leiden University supports collaboration between researchers and society because we can all use help with today’s big challenges. Why not join us sometime?

The cortège


In academic gown The cortège

A new  Cleveringa


A new Cleveringa

Development opportunities


Job hopper Development opportunities



Thriving community Camaraderie

City criminologist


City criminologist

The Cleveringa meetings


The Cleveringa meetings

Knowledge centre


Children and anxiety Knowledge centre


That ‘my’ Leiden University feeling



Unlovely but loved Lipsius

Academic ceremonies


Party! Academic ceremonies

Christiaan Huygens


ChatGPT Christiaan Huygens