The Caspian Sea or Mazandaran Sea is the biggest lake in the world. According to Androsov, a Russian scientist, Caspian Sea is the remnant of a big sea known as Tethys which covered a large part of the Iranian plateau during the 3rd millennium. As a result of warming of the climate, the earth Tethys Sea lost much water. It was disconnected from other parts and was changed into a lake. Covering an area of424,200 sq. km Caspian Sea, located between Asia and Europe, is the biggest lake in the world. Being landlocked the water is salty and is far bitter than other seas in the world. The Caspian Sea is 27 m below the surface of free seas. The length of Caspian Sea from north to south is 1,280 km and its width varies from 160 km to 440 km. The depth of Caspian Sea changes from north to south. It is 15m at north but at south or southwest and at the foot of Talesh Mountain Range the sea depth increases to 500 to 1,000 meters. The northern shores of Caspian Sea are lowlands and sandy and the Sea contains many sandy islands. The southern parts stretching from Astara Port to the mouth of Atrak River belongs to Iran.
The Iranian coasts at the foot of Alborz Mountain Range are all sandy, sunken and contain small gulfs and ponds, the habitat of important species like the Caspian Seal. Two important regions at south are separated from the Caspian Sea: Anzali Moat and Gorgan Gulf plus Miankaleh Peninsula. Ashuradeh Island which formerly was formed of several smaller islands opposite Gorgan Gulf has lately been connected to the Miankaleh Peninsula because of fall of the sea level.This landlocked sea has been called by various names such as Gilan, Mazandaran, Gorgan. Qazvin, Tabarestan, Deylam and Abeskoon seas by different tribes who have lived at its shores.
Sea of Oman
Sea of Oman neighbors Iran from Hormoz Strait up to Guatr Port. Sea of Oman covers approximately half of the southern coasts of Iran. The Sea of Oman joins the Indian Ocean and allows communication with the world at large. Thanks to the Caspian Sea at north and Sea of Oman at the south. Iran communicates with the outer world.
The Persian Gulf covers an area of 240.000 sq.m and connects the Iranian ports at the south to Sea of Oman and the Indian Ocean through Hormoz Strait. The length of Persian Gulf and Sea of Oman is 1.880 km. To read more about the Persian Gulf, please visit here.