Characteristics of the Region
Chal-Nakhjir Cave is located 11 km northeast of the city of Delijan, on the way to the city of Naragh in Markazi Province, on the slopes of Mount Takht (1716 meters high). This city is also located near the villages of Kerogan, Veshtekan and Harazjan.
Type of the Cave
This cave is a limestone cave and has several floors.
A unique feature of this cave is that it is a ‘live’ cave, one that is still evolving, and it is repaired by itself.
95% of the cave walls is covered with lime deposits.
According to some experts, this cave belongs to the third geological era and it dates back to about 70 million years ago.
Origin of the Name
In the past, this area was used as a hunting ground. It was located lower than the area around it; the hunters lead their hunt down to the area and then hunted them.
Chal (low) + Nakhjir (hunting place) = Chal-Nakhjir (lower than the hunting place)
The entrance of this cave is 10 to 40 meters high and about 40 meters wide.
The cave mouth was located higher than the water wells in Delijan County in the past, and it was not as wide as it is today. It is so wide now because of the improper explosions in the area.
When it was Discovered
This cave was discovered in February, 1988. It was discovered during digging wells in the area for drinking water.
The First Caving Expedition
Kamran Soleimani was the first person who stepped into the cave to explore it. He explored it to the depth of 500 meters, and he had to return because his trailing rope was not long enough.
Depth of the Cave
The depth of Chal-Nakhjir Cave is estimated to be approximately 8 to 10 kilometers, 4 kilometers of which has been explored by the locals and the cavers. About 1.2 kilometers is open now to the public visit.
According to the experts there is a lake at the end of the cave that makes boating possible there.
There are a large number of crystals discovered in the preliminary depth of the cave that’s been explored. The crystal prisms and sponges and coral gardens in the cave are the breathtaking beauties of the cave that catches every visitor’s eyes.
Length of the Cave
There are two routes inside the cave both of which are the same at first 600 meters and after that it is divided into two paths, one to the northeast and the other to the northwest. Each of the two paths are more than 1300 meters long.
What caused the cave formation might be the reverse fault in Varan region. Most of the rock formations in the cave are made of Calcium carbonate, Aragonite and Gypsum.
Some cracks have been created in the rocks thanks to the folds which have come from pressure on the rocks.
Then, the acid rain, containing carbon dioxide, has penetrated into the earth through these fractures and folds resulting in dissolution of calcium carbonate.
Next, the dissolutions increased and the cave was formed after millions of years.
This cave is a cave with a high ceiling. It is an average of about 8 meters high.
Among the other characteristics of the cave is that it is a water, horizontal cave.
Besides, the permanent ventilation in the cave causes that the cavers never suffer from the lack of oxygen in the cave.
The temperature of the cave varies between 7 to 14 degrees in different seasons that results in cool weather in summer and warm weather in winter.
In 2006, Chal-Nakhjir Cave was listed as a National Heritage by the Cultural Heritage Organization of the Islamic Republic of Iran.
There was water inside the cave in the distant past, but it is gone now because of the climate change. However, signs of water flow can still be seen on the walls of the cave.