Radiometric dating of the limestone indicates the formations are approximately 340 million years old.
The caves were one of the first locations in Australia to receive electric lighting for visitor tours in the late 19th century.
The Blue Lake's distinctive azure color is caused by the refraction of light through dissolved limestone particles.
Archaeological evidence confirms that the Gundungurra and Wiradjuri Aboriginal peoples utilized the valley long before European exploration.
The cave system contains a high concentration of unique species, including several cave-dwelling invertebrates found nowhere else on earth.
Jenolan Caves is a subterranean karst system located within a protected nature reserve in the Blue Mountains, recognized as the world's oldest discovered open cave system. The site features a complex network of limestone caverns characterized by intricate crystalline formations, underground rivers, and fossil deposits. Visitors access the caves through guided tours that navigate various chambers featuring stalactites, stalagmites, and helictites. The area also encompasses a surface ecosystem that supports diverse wildlife, including platypus in the Blue Lake. The karst landscape was formed by the dissolution of Silurian-era limestone over hundreds of millions of years. It serves as a primary site for ongoing geological and paleontological research.
The view of the Blue Lake with the historic Jenolan Caves House architecture in the background.
Wear sturdy, enclosed walking shoes with good grip as paths inside the caves can be wet, steep, and slippery.
Bring a light jacket or sweater, as the internal cave temperature remains a constant, cool 15 degrees Celsius year-round.
Book cave tours well in advance online, as popular guided sessions frequently reach capacity.
Arrive at least 30 minutes before your scheduled tour to account for parking and walking to the cave entry portals.
Attempting to explore the surrounding bushland without proper equipment or outside of designated walking tracks.
The site is open year-round, but specific cave tours may be suspended or limited during periods of high rainfall or extreme weather conditions.
Do not touch the cave walls or formations, as oils from skin inhibit the growth of crystals and damage the delicate environment.
