Hamadan Province is situated in a mountainous area in the centre of western Iran. Mt. Alvand is tallest peak in the province at 3,574m and with much of the area located well over 1,700m above sea level, it has the coldest and longest winters in the whole of Iran. A cool and pleasant summer climate does however attract tourists escaping from the intense heat elsewhere.
One of the most famous natural attractions in Iran, the Ali Sadr Cave, is situated approximately 100km north of Hamadan City. The cave is in fact a sealed underground lake of crystal clear water, quite unlike river caves whose water flows out through an exit. Thus the cave is completely devoid of plant or animal life.