One of the world's most mountainous countries, Iran contains two major ranges of mountains, the Alborz with the highest peak in Asia west of the Himalayas, Damavand (5671 m above sea level) and the Zagros that cuts across the country for more than 1,600 km extending from north west to the south east of the country.

Iran is one of the few countries that have all four distinguished seasons. And at any time of the year, in each section of the country, one of the four seasons is visible. Iran's variety in terms of temperature, humidity and rainfall differs from place to place and season to season. Length of the seasons differs in different regions.