This is a fun shot to shoot. It is the Skillion at Terrigal on the Central Coast NSW.
I should say that it is a VERY dangerous spot to shoot and you should know the area before attempting this shot. At certain wind directions and tides, the water hitting the ledge goes straight up and with a slight breeze blowing the spray the right way, you can get quite close to the ledge. I was shooting this with a 14mm lens on my Canon EOS1 DS and probably no more than 2M from the edge. The sppray height is also exagerated by getting down on one knee. All that salt water so close to Camera gear - all good if you take your time and watch it for ages before you start.