Located in Martigues, France, Plage Sainte Croix - la Couronne - Serie Camping Paradis A Martigues is a beautiful beach that stretches along the coast for about 2.5 km. The sand on this beach is a beautiful golden color and the water is crystal clear, making it the perfect spot for swimming, sunbathing, and other water activities such as kayaking, windsurfing, and paddleboarding.