There is a cavern with a hole at the ceiling of it, which allows light in. There is a lake with a river that feeds into it and an outlet. The light filters in and reflects off the water as it illuminates the mist. It is a blue-ish mist where the light doesn't touch, glowing on its own. Where the light does touch, the mist is a brilliant white/gold. There always is the form of a woman in the midst, though her apparent age always changes.
The entrance to that cave is a long, vaulted passage that snakes about. As a result, the light of the entrance doesn't reach the cave. It is pleasantly warm in the cave and the mist is refreshingly cool. The water of the lake and streams, however, is shocking cold. At the rear of the cave, there is a narrow tunnel which the water pours through as a roaring river. It is very dark there. Near the edge of this tunnel, there is a shallow, sandy bear with a shallow bottomed boat. There are no oars or other method of directing it, however.
To reach the small beach, one must swim across the water. On that small beach, it can be seen a small silver circle on the stone of the wall. Along the edge of the tunnel, there is an incredibly narrow path that is barely wide enough for one person to walk and the roof of the tunnel over the path is just high enough to allow one to stand upright.
A breeze blows up the tunnel and smells of the sea.