Danyal cave is located in Northern forests of Iran , 6 km far from Caspian seashores. A stream flows through the 2150 meters length of the cave. We will spend half an hour forest hiking to reach the entrance of the cave. There are some short waterfalls and narrow passages inside the cave that you should pass through. This means you should be ready for a walk inside cold streaming water. Complete survey in the cave takes about eight hours.