Plants & animals:
Mazandaran forests are a very important natural source of Iran. The forests have an important role in climatic balance and industry.thes forests are estimated 1544000 hectars and coverd with flat leaf trees and distinct from other Iranian forests.the Caspian sea and the Alborzes made a dense vegetation in the north,so that some parts are unreachable for man.the cover has an important role in Mazandaran’s climate.on over 2500-meter hights there is no forest because of cold.the Alborz humid forest is connected to Monudasht and Golestan jungles in the east.In the is section,the tree specious and appearances change because of the distance from the Caspian sea and lack of humidity.Mazandaran forests are used in many ways such as paper,carpentary products,coal,…
Various forest trees:
A variaty of trees are found in Mazandaran forests including oak (in mid high places),Azadarach(in mid high sections),…

The Mazaran plain generally has temperate and humid air known as the Caspian temperate air.Impressive factors in Mazandaran climate:the Alborzes and their direction,hight,neighbor hood to the sea,vegetation,local winds,geographical width,aproachment of northern and western airs.Among these factors,the mountains,the Caspian sea,and the winds have the most important roles. Generally,2 air system effect on the rigon. The air moving from Siberia to Mazandaran. This mass brings rain and snow in the winter, and makes it cool in the summer. The second system is the western winds blowing from the Atlas oceans and the Mediterranean and causing rain in the winter and cooling it down in the summer and making it moistly. Local winds such as sortock (from Siberia), Khoshabad Darre (from Noor), Uzrova, Gileva, Saam also blow into the province. Based on various factors, the province has three climates: Plain temperate, mountainous, moderately cold. Plain temperate air: Central and western plains of Mazandaran have this air. The rain in the area is 1200-1300 mm per year, thank to the sea, and the humidity. Humidity and mountains reduce the air pollution, moderate the air and decrease temperate difference.

Mountainous air:

This kind of air covers northern margins and the high Alborzes. The air in high places is mountainously cold. Other sections are mountainously moderate because of the distance to the sea, so they have less rainfall, but the high increase reduce the temperature, therefore, majority of the air fall is snow. The mountainous section is freezing in the winter and cool in the summer. That is why some people move to those places in the summer.

Semi desert air:

This air covers part of Gorgan plain (northern Gorganrood to former Soviet Union borderline). The reason is the far distance from the sea, the decrease in the Alborzes high, neighborhood to Turkmenistan desert on the north. The rainfall here, in Gorgan, is much less than Mazandaran, so that it estimates 500 mm in Gonbad Kavoos and the decrease in the humidity increases the temperature, so it has a far higher in compare to other parts.