The Caspian Sea:

The rich valleys and wooded hills of the Alburz Mountains, between Tehran and the Caspian Sea, attract heavy rainfall and in summer are apt to be humid and cloudy.
The Caspian coast area, consisting of Gillan, Mazandaran and Golestan
provinces occupies the coastal between the Alborz range and the southern shore of the Caspian sea. the vegetation is particularly lush in these provinces, on account of the mild average temperatures and of the large amount of precipitation.
Beyond the forest, all the areas under cultivation are the Rice paddies and the Tea plantations.
Caspian Sea Caviar from Sturgeon fish is the best caviar in the world.
Bandar Anzali and boating in Anzali lagoon is another interesting part of
Caspian Sea.