Mount Othrys (Greek: όρος Όθρυς – oros Othrys, also Όθρη – Othri) is a mountain range of central Greece, in the northeastern part of Phthiotis and southern part of Magnesia. Its highest summit, Gerakovouni, situated on the border of Phthiotis and Magnesia, is 1,726 m (5,663 ft) above sea level. The population density in the mountains is low: there are a few small villages, including Anavra in the northwest, Kokkotoi in the northeast, Palaiokerasia in the south and Neraida in the southwest. The length from west to east is about 35 km (22 mi) and the width from north to south is about 25 km (16 mi). The Pagasetic Gulf lies to the northeast, and the Malian Gulf lies to the south. The summit Gerakovouni lies 19 km (12 mi) south of Almyros, 27 km (17 mi) northeast of Lamia and 44 km (27 mi) southwest of Volos. The peaks of the range are above the tree line. The main mineral constituent of the rock is ophiolite.