Islas del Rosario, Cartagena’s low-lying coral islands
Published on 08/30/2026 at 12:03 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
South-west of Cartagena de Indias on Colombia’s Caribbean coast, Islas del Rosario forms a low-lying coral archipelago where coral islands, shallow reefs and mangrove-fringed shores share the same horizon. The group belongs administratively to Cartagena and sits within a marine national park created in 1977 to protect one of the country’s significant Caribbean coral reef systems.
Coral archipelago off Cartagena
Islas del Rosario, formally known as the Archipiélago de Nuestra Señora del Rosario, is a group of small coral islands lying off the insular zone of Cartagena de Indias in northern Colombia. The archipelago sits in the department of Bolívar, to the south-west of the city, off the western flank of the Barú peninsula in the wider Caribbean Sea.The islands belong to Cartagena’s municipal area
The Rosario Islands lie over a shallow submarine platform where coral has built up into cays and low islands rising just above sea level. Around the islands the sea shows marked colour changes, shifting from pale aquamarine over sandy seabeds to deeper blue above coral structures and seagrass meadows that fringe the reefs.The archipelago forms a low-lying coral landscape
A protected marine national park
The marine and insular area encompassing Islas del Rosario forms part of the Parque Nacional Natural Corales del Rosario y San Bernardo, a national natural park in Colombia’s Caribbean region.The park covers 120,000 hectares of sea, coral reef, mangrove lagoon and low-lying cays between the coasts of Bolívar and Sucre. It begins south of Cartagena near Punta Gigante on the Barú peninsula and extends towards the Archipiélago de San Bernardo further offshore.
Rosario and San Bernardo Corals National Natural Park was established in 1977, with an initial marine area later expanded to its present size of around 1,200 km² (460 sq mi).The protected area focuses on coral reefs and associated ecosystems, including mangroves, seagrass meadows and coastal lagoons. Within this park, Islas del Rosario forms one of the most accessible sections of protected clear Caribbean water near Cartagena.
Landscape of reefs, lagoons and low islands
The Islas del Rosario archipelago consists of a cluster of small islands, islets and cays, with Isla Grande and Isla del Rosario among the larger land masses.Several islands have inland lagoons where shallow water collects behind the shore, surrounded by vegetation adapted to saline conditions. Around many of the islands, mangroves occupy the margins between land and sea, their roots extending into the water at the edge of sandy beaches and channels.
Beyond the islands themselves, extensive coral formations fringe the archipelago, forming barrier-like structures and patch reefs scattered across the shallow platform. Seagrass beds spread across calmer areas, providing habitat for marine life and adding another texture to the underwater landscape.The park preserves a rich coral formation whose underwater relief contrasts with the low, flat profile of the islands rising above it.
Visiting Islas del Rosario: what travellers from Western Europe should know
- Islas del Rosario lies south-west of Cartagena in the Caribbean Sea, off the western side of the Barú peninsula, and access from the city is by boat from the waterfront areas.
- The terrain on the islands is low and coastal, with sandy shorelines, coral rubble and sections of mangrove; paths and jetties can involve uneven surfaces and steps close to the water.
- The archipelago sits at sea level in a tropical marine environment, with strong sun exposure on open beaches and jetties and limited shade away from vegetation.
- The official language is Spanish and the currency is the Colombian peso.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Islas del Rosario
Where are Islas del Rosario located?
Islas del Rosario lies off the Caribbean coast of Colombia, south-west of Cartagena de Indias, near the Barú peninsula in the department of Bolívar.
What should visitors expect on a trip to Islas del Rosario?
Visitors encounter low coral islands, sandy beaches, mangrove-fringed shores and clear shallow Caribbean water, all within a designated marine national park.
What makes Islas del Rosario distinctive among Colombia’s coastal areas?
The archipelago combines a shallow coral platform, low-lying islands and inclusion within Parque Nacional Natural Corales del Rosario y San Bernardo, giving it protected status as a marine ecosystem.
