Molesey Mysteries 4: The Water

Here is a picture of some water. Where did I take it?
?AB° CD.EF5 ?GHJ° KL.MN1
(Pic not zoomed in or out)
N51 2C.(A+B)(K+C)(E-D) W000 2(D).(N)(M-L)(J+M-C)
The hide here is challenging and the GPS bouncy, so if you need a hint please let me know.
You don't have to visit the location that the photo was taken- but of course you can if you want!