Diving in Costa Rica: 10 Sites Where Sharks Meet Turtles

Costa Rica punches well above its size underwater. Across 10 mapped dive sites — ranging from Pacific seamounts to sheltered beginner coves — you'll find water between 24 °C and 28 °C year-round and a marine life list that includes scalloped hammerheads, manta rays, and two species of sea turtle. Whether you're logging your first open-water dives or chasing pelagics at depth, there's a real site here for you.

Best dive sites in Costa Rica

• Cocos Island — Bajo Alcyone (advanced, 15–40 m): The headline act. A seamount roughly 550 km offshore where scalloped hammerhead schools and manta rays are regularly recorded. Strong currents demand solid buoyancy skills.
• Bat Islands — Big Scare (advanced, 18–35 m): Named for good reason. Blacktip reef sharks are common, and the surge along these northern Pacific rocks keeps less experienced divers on shore.
• Cocos Island — Dirty Rock (advanced, 12–35 m): Another Cocos seamount with similar pelagic action — hammerheads, mantas, the occasional bottlenose dolphin — at slightly shallower entry points.
• Las Catalinas Islands (intermediate, 8–30 m): The most accessible stepping stone to bigger Pacific diving. Green sea turtles and hawksbill turtles appear reliably, and the depth range suits divers building confidence.
• El Arco / Jardín Medio / La esquina del jardin (intermediate): A cluster of sites with reef structure, manageable currents, and a good chance of turtle encounters without the offshore commitment.
• El Andia - Jureles / Diving and snorkeling point / La Cueva (beginner): Shallower, calmer, and well-suited to new divers or those who want an easy second dive after a deeper morning.

When is the best time to dive in Costa Rica?

Diving is possible every month of the year. Water temperature holds between 24 °C and 28 °C regardless of season, so there's no cold-water penalty for travelling off-peak. Visibility and surface conditions vary more by site than by month — Cocos Island liveaboards typically run year-round, while local Pacific sites can see choppier seas during the rainy season (May–November).

Is Costa Rica good for beginners?

Yes, with the right site choice. El Andia - Jureles and the snorkeling point offer calm, shallow conditions where new divers can get comfortable. Cocos Island and the Bat Islands are strictly for advanced divers with current experience — the depth and surge are not negotiable.

What you'll see

The recorded marine life list covers scalloped hammerheads, manta rays, blacktip reef sharks, green sea turtles, hawksbill turtles, and bottlenose dolphins. Pelagic species concentrate around the offshore seamounts; turtles appear more consistently at nearshore sites like Las Catalinas.

FAQ

Do I need a liveaboard for Cocos Island? Yes. Cocos Island is a UNESCO World Heritage Site roughly 36 hours by boat from the mainland. All diving there is done from liveaboard vessels; day trips are not an option.

What certification do I need for the Bat Islands? Advanced Open Water at minimum, with current diving experience strongly recommended. Most operators will ask about logged dives before confirming your spot.

Is visibility good at Costa Rican dive sites? It varies. Cocos Island and the Bat Islands can offer excellent open-water visibility, while some nearshore sites run murkier depending on rain and runoff.

Can I dive and surf on the same trip? Easily. The Guanacaste coast in particular has surf breaks and dive sites within short distance of each other.

Costa Rica dive map