(Compare the Welsh y môr bychan), as opposed to the Atlantic Ocean outside, (Ar Mor Bras).

The site best known to outsiders is Carnac, where remains of a dozen rows of huge standing stones run for over ten kilometers.

The passage grave of Gavrinis, on a small island in the Gulf, is one of the most important such sites in Europe.

Because this gap is narrow, the tidal currents are strong and water speeds can reach up to 9.4 knots.

The highlight of the festival is a 'Big Parade of Sail' in which all the boats are displayed en route from Port Navalo to Vannes.