It is a lake born where they worked the clay after the abandonment of the production plant. The road to get there is quite steep, but you get a nice view over the city. Unfortunately, the lake itself cannot be reached due to the tall grass and the scrub, the only path (abandoned and not cared for) is closed to the passage by a gate. This at least from Brignano, I have never tried to get there from the other side (above the exit of the via irno ring road) because I think we have to go through private property, but I'm not sure.