The Ile Wrac'h lighthouse is located in the Aber-Wrac'h estuary, a few hundred metres from the "north" coast of Finistère. The current lighthouse was built in 1845 and is in the form of a square tower painted in white overlooking the sea level by more than 20 meters. Along with various other light houses along this part of the coast, they helped provide guides for all of those sailing amidst the thousands of small islands and rocks scattered along the entrance of the Aber Wrac’h estuary.

The lighthouse and the island are accessible on foot from the mainland during low tide. Low tide is generally for six hours each day but will vary depending on the tides.

A visit to the bay, at low tide, provides a great opportunity to see the local oyster beds used to produce Legris Oysters. The bay lays in the heart of the Lilia archipelago, at the river mouth of the estuary. The environmental conditions here provide a unique balance of rich mineral waters (coming from the river) and the area where it meets clean sea currents.

The oyster spat (young oysters) come from Vendée or Charente in France. The spat is put into oyster bags that are then hooked onto metallic racks placed on the foreshore.

During each low tide, the oyster beds are uncovered by the sea and local oyster farmers use this time to shake and turn over the oyster bags. This shaking process enables the oysters to keep an even hard shaped shell.

The Legris oysters reach their market size after 3 to 5 years. They are then graded and packed into hampers before being distributed all over France. Because they are grown exclusively in the conditions of the Aber Wrac’h estuary, the oysters are well renowned for their distinct taste of the open sea.