Caño Ratón is an open marine channel crossing Isla Grande from east to west—a true passageway through the heart of the Rosario Islands. With depths ranging from approximately 2 to 5 meters, it’s wide, navigable, and framed by underwater coral outcrops and mangrove-lined shores—typical of the Park’s mostly marine ecosystem patrimonionatural.org.co.
Far from a freshwater estuary, this channel is shaped by Caribbean tides and currents, preserving the area’s marine character. Visibility is usually good, between 5 and 10 meters on calm days—perfect for snorkeling, floating gets, or drift swims.
Ecologically, it showcases the Park’s coral reefs and seagrass beds that lie just off its banks—part of the expansive 420 km² coral platform that gives this national park its claim to fame . Expect to see species like queen angelfish, butter hamlets, juvenile snapper, along with rays gliding near the sandy bottom.
Culturally, locals use Caño Ratón as a quiet connector between island stops—it’s the classic backdrop for everything from mid-day swims to chilled boat-side lunches with the Mangrove community on shore.
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