La Guérinière, village oyster, maraîchin and Saulnier, cutting its narrowest part of the island in two. The town is protected from winter winds on the ocean side by a cordon of dunes over the centuries has covered the houses located near the beaches. Villages of primitive build such as the Bot and Ecloux have disappeared completely, covered by dunes. Facing the continent, the Bay of Bourgneuf is already silted up considerably and at low tide you can walk through to get to the mainland.
A wealth of the island and its villages is the culture of the potato, "the Bonnotte" a little early potato taste incomparable, grown in 1 / 3 of land, 1 / 3 sand and 1 / 3 algae collected on the beaches, and harvested by hand.
