From the Wikipedia page 
Communauté d'agglomération Val d'Yerres Val de Seine is the communauté d'agglomération, an intercommunal structure, covering southern suburbs of Paris. It is located in the Essonne department, in the Île-de-France region, northern France. It was created in January 2016. Its population was 177,769 in 2014. Its seat is in Brunoy.
The communauté d'agglomération consists of the following 9 communes: