Pénestin's history stretches back to prehistoric times, evidenced by megalithic monuments such as dolmens and menhirs scattered across the area, indicating early human settlements in the region.

Geographically, Pénestin is defined by its diverse coastline, comprising both sandy beaches, such as Plage de la Mine d'Or, and dramatic cliffs, making it a popular destination for tourism and coastal walks.

Pénestin's population, like many coastal communities in Brittany, experiences seasonal fluctuations, with a significant increase during the summer months due to tourism, impacting local infrastructure and resources.

Historically, Pénestin was part of the ancient Duchy of Brittany, sharing its political and cultural destiny until the duchy's incorporation into France.

The local economy of Pénestin is heavily reliant on tourism, particularly during the summer months, driven by its beaches and coastal scenery.

Agriculture, especially the cultivation of mussels and oysters, plays a vital role in Pénestin's economy, contributing to the region's reputation for seafood.

The famous Mine d'Or (Gold Mine) beach gets its name from the golden color of the cliffs, a result of iron oxide deposits, though historical gold mining activities were minimal.

The port of Tréhiguier is a key center for mussel farming in Pénestin, where visitors can observe the traditional methods of aquaculture.

Pénestin retains a strong Breton identity, with the Breton language and cultural traditions, such as traditional music and dance, still practiced and celebrated within the community.

The church of Saint-Gildas, a prominent landmark in Pénestin, reflects the architectural style typical of Breton religious buildings, often featuring elaborate stonework and stained glass.

Pénestin's coastline is vulnerable to coastal erosion, a significant environmental challenge requiring ongoing monitoring and potential mitigation measures.

The commune of Pénestin is administered by a mayor and a municipal council, responsible for local services and infrastructure development.

While Pénestin is not directly associated with any UNESCO World Heritage sites, its proximity to other culturally significant areas in Brittany benefits its tourism.

The annual Fête de la Mer (Sea Festival) is a popular event in Pénestin, celebrating maritime traditions and local seafood with music, food stalls, and boat races.

The presence of various ecological sites contributes to the conservation of biodiversity within Pénestin's territory and adds to its appeal for nature-based tourism.