Saint-Omer, situated in the Hauts-de-France region, originated as a settlement around the monastery of Saint Bertin in the 7th century.

Geographically, Saint-Omer sits in the heart of the Audomarois marshland, a unique environment shaped by reclaimed polders and intricate waterways.

Historically, Saint-Omer played a significant role in the defense of the region, being fortified by Vauban in the 17th century.

The population of Saint-Omer has experienced fluctuations over the centuries, witnessing periods of growth during industrial expansion and decline following deindustrialization.

Saint-Omer was once a prominent center for Jesuit education, housing a significant English Catholic college that produced notable figures such as several saints and martyrs.

The Audomarois marshland, recognized as a UNESCO Biosphere Reserve, contributes significantly to the ecological and cultural heritage of Saint-Omer.

The local economy of Saint-Omer relies on agriculture related to the marshlands, along with some light manufacturing and tourism.

Saint-Omer's rich architectural heritage includes the impressive Gothic cathedral of Notre-Dame, featuring a complex astronomical clock.

The Hôtel Sandelin, a museum housed in a former aristocratic mansion, displays an extensive collection of fine arts and local history artifacts.

Saint-Omer's cultural landscape is vibrant with traditional festivals, including the annual horticultural exhibition, showcasing the marshland's produce.

The town hall of Saint-Omer, a historical landmark, reflects Flemish architectural influences, attesting to the town's proximity to Belgium.

The Saint-Omer Public Garden, designed in the 19th century, offers a green oasis within the town, exhibiting a variety of plant species.

The local gastronomy of Saint-Omer features regional specialties utilizing the marshland's resources, such as watercress and endives.

Saint-Omer's strategic location has made it a key transport hub, particularly regarding canal systems, connecting the town with wider European waterways.

The annual "Fête du Marais" celebrates the Audomarois marshland, offering boat tours, market stalls, and traditional music, reflecting the local culture.