This is a three minute time exposure with the lens wide open. Mostly I was photographing the fog and Golden Gate bridge, but for this exposure I turned my camera around on the tripod and pointed it northwest towards the summit of the Slacker Ridge. The ambient light from the bridge and San Francisco is illuminating the brown grass leading up to the ridge, and providing the glow in the sky towards the right (eastwards, towards the Bay) of the photo.
This steep hill sits in the Marin Headlands overlooking the Golden Gate Bridge and San Francisco. Based on the signs I saw, I think Slacker Ridge is home to a mountain lion, lonely lord on the border of city and wild.