Very close to the phare, in fact as the port grew up it is on a beach behind the big artificial " digue" they built to protect the port from the swell, the easiest access is from the bay by jet ski or boat because from inside the port you need to know the area or going with that knows where to park close to that beach.
Sometimes very difficult, you need to go trough a international port area under military control. Need to have a good knowlegdge of pointe noire. Other access by jetski, or boat