(390 km2, max elevation 1054 m) extends between Ossa and Pilio mountains and was restored totally in Magnesia. It mainly consists of schist and, in less extent, of limestone. The marine area covered 2% of the site, the terrestrial area covered 96% and the reservoirs covered 2%.

Its northeast side ends in steep cliffs in the Aegean Sea. At the higher zone, it is mainly covered by oak forests