Dive Site: Catalina Grande

About Catalina Grande

Catalina Grande is a premier dive site within the Catalina Islands archipelago, a collection of volcanic pinnacles located off the North Pacific coast of Guanacaste, Costa Rica. This site is renowned for its rich pelagic encounters, offering divers consistent sightings of various ray species and sharks. The underwater topography consists of dramatic volcanic rock formations, providing ample habitat and foraging grounds for a wide array of marine life. The site's depths range significantly, attracting both abundant reef fish and larger oceanic creatures. Nutrient-rich currents, particularly during cooler water periods, draw in large schools of rays and other pelagics. While specific details on the coral structures are less emphasized, the rocky substrate provides a foundation for diverse ecosystems. Divers here can expect to navigate varied conditions, including potential thermoclines and surge, which contribute to the dynamic environment. Despite these factors, the site is accessible to a range of skill levels, though comfort with free descent and ascent is beneficial. The consistent presence of iconic marine animals makes Catalina Grande a highly sought-after destination for those seeking thrilling encounters in Costa Rican waters.

Dive site facts: Catalina Grande

Depth

13–36 m

Typical dive

12–25 m, 50–60 min

Current

Strong at times, moderate surge

Visibility

50–69 ft (15–21 m)

Water temperature

16–30°C (60–86°F)

Entry

Tender / back-roll

Level

AOWD recommended, comfortable with currents and buoyancy

Dive type

Pelagic, rock formations

Region / port

Guanacaste Province, Pacific Coast

Coordinates

10.475, -85.81

Conditions & Currents

Currents at Catalina Grande can be strong, posing a rewarding challenge for divers. While not typically drift dives, divers should be prepared for free descents and ascents, necessitating good buoyancy control. Surge can also be present and, at times, considerable, so divers unfamiliar with such conditions should inform their divemaster. Thermoclines are common, indicating layers of varying water temperatures and often attracting diverse marine life. Visibility can change site to site and day to day, but the absence of river run-off helps maintain overall clarity. These dynamic conditions underscore the need for a comfortable skill level, especially regarding buoyancy and air management, to safely enjoy the rich environment.

Marine life & sighting chances

Giant Oceanic Manta Ray

Jan-Mar (peak), Nov-May (general) · common

White-tip Reef Shark

common

Cownose Ray

common

Spotted Eagle Ray

common

Mobula Ray

common

Green Moray Eel

common

Octopus

common

Hawksbill Sea Turtle

occasional

Humpback Whale

Aug-Sep (heard underwater) · occasional

Moorish Idol

common

Pufferfish

common

Dive profile & how the dive runs

Your dive at Catalina Grande typically begins with a back-roll entry from the tender, followed by a free descent to the main rock formation. Divers often explore the wall and surrounding volcanic pinnacles, with depths commonly ranging between 13 to 36 meters. The route is often guided by the divemaster to optimize sightings of pelagic life, such as manta rays and sharks, which frequent the deeper sections and current-swept areas. Pay attention to thermoclines that can shift visibility and temperature. The dive usually progresses shallower, allowing for extended bottom time and observation of smaller reef inhabitants. The turn point is determined by air consumption and no-decompression limits, with the safety stop conducted in mid-water, maintaining good buoyancy control for a safe and controlled ascent.

Underwater photography

To capture the dynamic pelagic action at Catalina Grande, a wide-angle lens is essential for documenting the impressive manta ray and schooling cownose ray encounters. Given the potential for lower visibility and thermoclines, external strobes are highly recommended to bring out natural colors and details in your subjects. Be prepared for varying light conditions and swift-moving subjects, often requiring faster shutter speeds. Excellent buoyancy control is critical, especially when positioning yourself for shots in stronger currents or near the often-uneven volcanic rock formations. Patience is key, as some of the most spectacular sightings can be brief; always prioritize responsible diving practices and avoid disturbing marine life for a photo.

Combine with nearby dive sites

• Clasico

  Another dive site within the Catalina Islands, offering similar marine encounters.

• La Pared or The Wall

  A beautiful and often shallower site within Catalina Islands.

• Sombrero

  A dive site within the Catalinas Islands, part of common itineraries.

• Punta Norte

  Located within the Catalinas Islands, known for diverse marine life.

• Punta Sur

  Another Catalinas Islands dive site, typically part of local dive tours.

Getting there & logistics

Most dive trips to Catalina Grande depart from towns like Playa del Coco, Flamingo, Conchal, or Tamarindo in the Guanacaste Province. The journey to the Catalina Islands typically takes about 30 minutes by boat from Flamingo. Divers usually fly into Daniel Oduber Quirós International Airport (LIR) in Liberia, which is the closest international gateway to this region. Day trips usually include two dives, often combining Catalina Grande with another site within the archipelago. There are no specific park fees mentioned for Catalina Grande itself, but dive operator packages will cover boat transfers and guide services. It's common for dive operations to offer both certified dives and discovery dives for uncertified individuals, with a maximum depth of 12 meters for the latter.

Safety & environment

While diving at Catalina Grande offers incredible encounters, safety is paramount due to potentially strong currents and surge. Divers should possess good buoyancy control and be comfortable with free ascents and descents. The nearest recompression chamber is located in San José, approximately a 4-hour drive from the Guanacaste coast, emphasizing the importance of prudent dive planning and adherence to safety protocols. Comprehensive dive insurance, covering emergency evacuation and hyperbaric treatment, is highly recommended. Always follow your divemaster's instructions, especially concerning entry and exit procedures, and maintain awareness of your surroundings. Proper wetsuit thickness is crucial for managing thermoclines and preventing hypothermia, particularly during cooler months.

Who it suits — and who it doesn't

FAQ

Catalina Grande FAQ

Liveaboards diving Catalina Grande

These liveaboards may visit Catalina Grande on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Cocos Aggressor

Costa Rica

22 guests37.8 m

$636/day

Sea Hunter

Costa Rica

20 guests

$690/day

Okeanos Aggressor II

Costa Rica

24 guests36.6 m

$504/day