The departure point is at the tip of Kastell Ac'h in the commune of Plouguerneau. The tip is only accessible on foot from the various car parks, which are few in number and quickly fill up during the season or during spring tides (shellfish gathering).
(S/E) Take the stone ramp at the point and finish with a staircase to descend onto the coarse sand of the beach.
(1) Continue along the beach towards the north-east and reach the rocky shoal.
(2) Turn north-northwest and walk carefully along the rocky outcrop: seaweed covers the rocks, some of which are a little unstable.
(3) Move away from the edge of the rocky outcrop and continue through the centre, crossing a few shallow pools.
(4) Return to the coarse sand to reach the stone slipway on Île Vierge. Reach the foot of the lighthouse.
(5) Follow the path in reverse to return to the starting point on the mainland (S/E).