This area protects mainly marine vegetation such as seagrass beds, which, as do the coral reefs, provide shelter for a great variety of algae. The Park contains 7% of the seagrass meadows of the Colombian Caribbean sea and the most extensive and best preserved are the ones in the San Bernardo archipelago. The area also has red mangrove (Rizophora mangle), white mangrove (Laguncularia racemosa) and a few samples of black mangrove (Avicennia germinans).