There is a vastly extended network of rivers in Iran most of which seasonally are filled with water. Some permanent rivers run from the Alborz or the Zagros to the Caspian Sea, Persian Gulf and Oman Sea.
Due to the range of culinary traditions across the Iranian provinces, food in Iran is extremely diverse. Common to all the Iranian provinces however, is the fact that Iranian food tends to be both healthy and nutritious.
The time of Islamic festivals is calculated according to local sightings of various phases of the moon and the dates given below are approximations which are subject to change each year.