This is a 210 second time exposure of the small lake at the bottom of Tennessee Valley. Beyond the lake, you can see the outline of the ocean and Tennessee Beach. (This photo shows Tennessee Beach, with this small lake on the mid-right.)
Above the lake, you can see the ridge line descending to the ledge where I took some of the earlier photos in this series.
If you look closely at the lake itself, you can see the stars reflected in its extremely still waters.