Having been the capital of Median, of Achaemenian and then of Parthians and Sassanians, Hamadan has the most illustrating past, the highest elevation and the finest situation of any living city in Iran. Its blue pottery industry, its large green belt, lying at the foot of the Zagros range, and its Alisadr cave which is the longest water cave in the world, add more vitality to this city.
One of the best option to visit if you travel to iran or you are going to visit iran. The said cave is the largest in the world( in IRAN ), containing water and offering the use of canoes. This cave is located in the village of Alisadr, district of Kabudrahang, and was inaugurated in the year 1967. In the hills where the Alisadr cave is located, there are two other caves by the names of Soo Bashi and Sarab Caves. The water present in Alisadr Cave, takes its source from that of the Sarab Cave. The Alisadr Cave comprises of a number of small and large ‘halls’ or spaces, in a maze like fashion, connected to each other by passages.
The water within the cave is extremely cold but very clear, odorless, colorless and with an ordinary taste. It comes under the calcium bicarbonate category, is nearly neutral in PH, but unfortunately polluted. The ceiling of the cave is covered with a sedimentation of pure calcium carbonate and a mixture of other chemical compounds. Thus forming stalagmites of unique beauty and design, which draws the attention of visitors. The air within the cave is light and static.
To date, all the canals of this cave have not been discovered, and only approximately 2,100 m. have been recognized. Here, the height of the ceiling is between 1-35 m. the width of the canals 2 – 15 m. and the depth of the water 1 – 17 m. Within the cave, electric power, and paddling canoes (seating 4 persons) aid visitors to see parts of this cave.