This photo was taken at the Marche Richard-Lenoir, which is held every Thursday and Sunday beginning at 7:00 AM on Boulevard Richard-Lenoir between rue Amelot and rue Saint-Sabin. (Hmm, according to the sign in the picture, the Saturday market opens at 10:00. These may be the winter hours.) The market stretches for blocks along the tree-lined boulevard that separates the Marias from the Bastille. (Actually, I think the walkway down the middle of Boulevard Richard-Lenoir is above where the Canal Saint Martin goes underground.)
I walked down there one Thursday after my language lesson (about 15 minutes from my apartment) and was overwhelmed by all the stalls, vendors, and crowds plus the traffic navigating its way on the roundabout at place de la Bastille. As well as all kinds of food, you can find clothing, shoes, scarves, linens—even North African and other international fare.