Here is an image of Cap Canaille, which dominates over the town of Cassis, near to Les Calanques. The photo was taken in the early evening from one of the beaches, which I think gives the photo a quite nice light, and as this is of course Provence in summer, the sky is perfectly clear. Taken in the evening, a lot of the tourists had gone leaving the picture quite free of people and swimmers. Though I am unsure of this, I think I remember reading somewhere that Cap Canaille is that red shade because it was made of the same type of rock that is commonly found in Corsica and parts of Sardinia, which can also be seen with the distinctive red shade there. There is a famous painting of the headland by Paul Signac.