Saint-Denis-d'Oléron, on the Île d'Oléron, is a historic commune with roots dating back to the Middle Ages, evidenced by the remains of a fortified church from the 11th century.

Geographically, it is the largest commune on the island, covering an area of 56.27 square kilometers and boasting 12.3 kilometers of coastline.

The population of Saint-Denis-d'Oléron has experienced steady growth, rising from 1,231 in 1800 to 1,391 in 1901 and reaching 1,625 in the 2017 census.

The local economy is heavily influenced by the maritime industry, with oyster farming and fishing playing significant roles.

Saint-Denis-d'Oléron hosts an annual oyster festival, "Les Océanales de l'Huître," showcasing the region's renowned oysters and attracting visitors from afar.

The commune is home to several notable landmarks, including the Musée de l'Île d'Oléron, which exhibits the island's rich history and heritage.

The Fort Royer, a 17th-century fortification built by Vauban, stands as a testament to the island's strategic importance.

Saint-Denis-d'Oléron is renowned for its picturesque beaches, such as Gatseau, dominated by dunes and maritime pines, offering stunning views of the Atlantic Ocean.

The commune has a strong sense of community, with traditional festivals and events celebrated throughout the year, such as the "Fête de la Saint-Louis" in August.

The Church of Saint-Denis, with its Romanesque bell tower from the 12th century, is a notable historical monument in the commune.

Saint-Denis-d'Oléron has contributed to national history, being the site of a major naval battle in 1666 during the Anglo-Dutch War.

The commune is committed to sustainable development, implementing measures to protect its natural environment, including the creation of a marine reserve.

Its strategic location near the mouth of the Charente River has made Saint-Denis-d'Oléron a vital port throughout history.

The commune has fostered a thriving artistic community, with local painters and sculptors showcasing their works in galleries and exhibitions.

Saint-Denis-d'Oléron is not affiliated with any UNESCO World Heritage Sites.