Catalina island is one of the best scuba diving spots in Costa Rica. Located just north of the many resort-based towns in northern Guanacaste Province, within the Bat Islands (Islas Murcielagos), Catalina is accessible to divers staying in Tamarindo, Flamingo, Conchal, Papagayo, etc.
The Catalina Island chain is an archipelago of rocky islets 2-15 miles off the northwest coast of Costa Rico (off the Nicoya peninsula). “Islands” is something of a misnomer as the Catalinas are actually just huge rocky outcroppings.
Because the islands are so isolated and so far from the mainland, you will see a huge variety of undersea life. The marine life off the Catalina Islands is nothing short of amazing. The Catalinas are well-known for rays. You can expect to see not only manta rays but also bat rays, mobley rays, spotted rates, bullseye rays and stingrays. These unusual sea animals will amaze you with their grace and beauty.