Due to the particular weather conditions of the Mar Menor, with a great number of hours of sun a year and high salinity levels, some muds suitable for therapeutical treatments have been stocked for centuries at the northern end of the lagoon.
The latest studies by Universidad de Murcia in 1995 show that these sediments have a high percentage of cations, calcium, magnesium, potassium and fluoride, as well as anions, chloride and sulphate in levels which are well over the expected ones, even for waters of this salinity level