Carnac is a little sea town in the west of France (Bretagne).
A good place to get food is supermarket Super U near of the beach. You have like 4 or 5 garbage boxes at the right of the entrance. Nobody will say you anything. If a vendor comme and tell you to not do it, answer him politely that your not doing anything illegal.
You also can get food at the different bakeries of the city. You can find baguette, bread, pizzas and many food of good quality.
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