Grotte marine delle Tremiti

The sea caves of the Tremiti Islands are openings in the archipelago’s limestone coastline, distributed around San Domino and San Nicola. The best-known include the Grotta del Bue Marino and Grotta delle Viole on San Domino, and the Grotta di San Michele on San Nicola; together they form part of the islands’ distinctive coastal landscape.

Why it matters

The caves reveal the same coastal landforms that continue beneath the sea. The Comune identifies the Grotta del Bue Marino as one of San Domino’s most striking natural features, while the Gargano National Park describes caves and rock formations around both San Domino and San Nicola. Their setting also lies within the Isole Tremiti marine reserve, established by decree in 1989.

What to notice

On San Domino, the Grotta del Bue Marino is a prominent sea cave, and the Grotta delle Viole is another named opening in the island’s southern coastline. Nearby formations include the Scoglio dell’Elefante, the natural arch known as the Architiello and the rocks called the Pagliai. On San Nicola, the Grotta di San Michele and the adjacent Scogli Segati are among the features recorded by the park authority. The park also notes a Roman shipwreck off Punta di Zio Cesare.

Context and history

The Tremiti archipelago was known in antiquity as the Diomedee. Its coastal caves and rock formations are part of a landscape shaped by the interaction of limestone and the sea. The marine reserve was created in 1989; management passed to the Gargano National Park authority in 1991. The protected area is divided into zones with differing rules for activities at sea.