It's a water-filled valley covered in clouds or fog. Legend has it that somewhere within this valley is a dark cavern that is said to be of great significance.
In the Land of Lightning, there is a gigantic and ancient turtle that Kumogakure has cared for since its founding. It serves as a training ground for the Kumo ninja, and is described as a moving fortress. Its size is so great that it can host other large animals as well as other natural and man-made structures.
The hot springs are natural hot water springs that exist in the mountains, and in this country they are in abundance. It its common to see people taking baths in them and some people even have build huts near some of the best spots to make profit of it.