[trux]

Are you sure you are coming to France? Martega is in Italy, and there is no Gulf of Leon in France. If you rather mean the Gulf of Lion, then it is in the western part of the French Med coast, but I still know no place here with a name ressembling Martega.

If you come to the Gulf of Lion, then be ready for rather cold water - it is the ever coldest place of the Med. Water temperature is usually same as on the French Atlantic coast. In October it usually drops below 15°C rather early, and in November it may be sometimes as low as 10°C. Even in top summer it often happens that the water temperature is just 17°C.