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Mazandaran (Persian: مازندران) is a province in northern Iran, bordering the Caspian (Mazandaran) Sea in the north. Mazandaran was part of the Persian province of Hyrcania.
Mazandaran province is geographically divided into two parts: the coastal plains, and the mountainous areas. The Alborz Mountain Range surrounds the coastal strip and plains of the Caspian Sea like a huge barrier.
There is often snowfall during most of the seasons in the Alborz regions, which run parallel to the Caspian Sea's southern coast, dividing the province into many isolated valleys.
Reference :
http://en.wikipedia.org/wiki/Mazandaran