The main mountain chain is the Zagros Mountains, a series of parallel ridges interspersed with plains that bisect the country from northwest to southeast. Many peaks in the Zagros exceed 3,000 meters (9,843 ft) above sea level, and in the south-central region of the country there are at least five peaks that are over 4,000 meters (13,123 ft).
As the Zagros continue into southeastern Iran, the average elevation of the peaks declines dramatically to under 1,500 meters (4,921 ft). Rimming the Caspian Sea littoral is another chain of mountains, the narrow but high Alborz Mountains. Volcanic Mount Damavand, 5,610 meters (18,406 ft), located in the center of the Alborz, is not only the country’s highest peak but also the highest mountain on the Eurasian landmass west of the Hindu Kush.