Cal Cave is officially recognized as the second-longest cave in the world, with total explored passages exceeding 8 kilometers.
The interior contains a subterranean stream that flows year-round, which contributes to the high humidity levels within the cave.
The cave entrance is located at the base of a steep limestone cliff, creating a significant temperature differential compared to the external environment.
The walkway system is elevated to protect the delicate geological formations from direct human contact while providing safe access over the stream.
Cal Cave is one of the world's longest caves, featuring an active underground stream and a wooden walkway system spanning approximately 400 meters of the interior. The cave is situated at an altitude of 1,050 meters and serves as a natural tunnel through the limestone mountainside. Inside, visitors encounter stalactites, stalagmites, and various rock formations created by long-term water erosion. A small waterfall flows near the entrance, and the cave maintains a consistent internal temperature throughout the year. The primary visitor path follows the stream bed, eventually leading to a dramatic exit point overlooking the Düzköy valley. The cave is part of a larger karst landscape characteristic of the Trabzon region.
The wide, arching cave entrance from the inside looking out, which frames the green valley landscape.
Wear non-slip footwear as the walkway surfaces become slick due to constant cave moisture.
Bring a light waterproof jacket or layer, as the cave is significantly cooler than the outside temperature regardless of the season.
Avoid touching the cave walls or formations, as oils from human skin can disrupt their natural preservation.
Do not wander off the marked wooden walkways, as the surrounding limestone is unstable and the cave floor can be uneven or flooded.
Maintain a low voice to respect the acoustics; flash photography is discouraged near sensitive mineral formations.
