Medicinal Mud of Lo Pagán Nature · San Pedro del Pinatar, Mar Menor, Murcia Image of San Pedro del Pinatar, not of the place itself. Pools of grey mud beside the salt pans of Lo Pagán, with therapeutic properties known since ancient times for their high content of calcium, magnesium, potassium and other minerals; they make up the largest free mud-bathing area in Europe. Photo: Anidae (CC BY-SA 4.0) What to see and do in San Pedro del Pinatar