The Brussels universities ULB and VUB (Stephan Kampelman, Marco Ranzato and Fabio Vanin) were invited together with representatives of IFSTTAR institude, Paris and Institut EDDEC, Montreal to the two days seminar “Ville et économie circulaire – Bruxelles, Montreal, Paris” held at la faculté de l’aménagement de l’Université de Montréal – October 13, 14. The aim of the event was to brings together researchers and professionals of the three cities to discuss innovative approaches, initiatives and researches on circular economy to reinforce the international network working on that theme. Latitude (Marco Ranzato) has presented the last results Latitude-ULB work Ilot d’eau, to feed the discussion in comparison to other international researches.