Iran is one of amazing and 18th-largest country in the word. It is is bordered on the north by Armenia, Azerbaijan and Turkmenistan, with Kazakhstan and Russia to the north across the Caspian Sea. To the east Iran is bordered by Afghanistan and Pakistan, on the south by the Persian Gulf and the Gulf of Oman, on the west by Iraq and on the northwest by Turkey.
It consists of the Iranian Plateau with the exception of the coasts of the Caspian Sea and Khuzestan Province. The country is divided into 31 provinces and is one of the world's most mountainous countries. Its landscape is dominated by rugged mountain ranges that separate various basins or plateaux from one another. The populous western part is the most mountainous, with chains such as the Caucasus, Zagros and Alborz Mountains; the last contains Iran's highest point, Mount Damavand at 5,610 m (18,406 ft). The northern part is covered by dense rain forests called Shomal or the Jungles of Iran. The eastern part consists mostly of desert basins such as the Dasht-e Kavir, Iran's largest desert, in the north-central part of the country and the Dasht-e Lut, in the east as well as some salt lakes. This is because the mountain ranges are too high for rain clouds to reach these regions. The only large plains are found along the coast of the Caspian Sea and at the northern end of the Persian Gulf, where Iran borders the mouth of the Shat tal-Arab (or the Arvand Rūd) river. Smaller, discontinuous plains are found along the remaining coast of the Persian Gulf, the Strait of Hormuz and the Gulf of Oman.
In Iran at any time of the year, in each section of the country, you can enjoy one of the four seasons. 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. Iran is one of the world's most mountainous countries that 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.
Species diversity in Iran
Because of different habitats and climate in each parts of Iran, lot of species of insects are exist in Iran that most of them are endemic of Iran, and for this Iran is one of the most interesting and amazing country in the world for collectors and scientists.