The Château de Trémazan is a ruined castle in the commune of Landunvez in the Finistère département of France. It is located below the coastal road, hidden from the sea.
Wikipedia https://en.wikipedia.org/wiki/Château_de_Trémazan
Address Kersaint 29840, France
Coordinates 48°33'3.526" N -4°42'44.239" E
