Dive Site: El Bajo Seamount

About El Bajo Seamount

El Bajo Seamount, also known as Marisla Seamount, is a world-class advanced dive site located off La Paz in the Sea of Cortez. This submerged mountain features three distinct peaks, rising dramatically from the deep ocean floor, creating powerful upwellings and strong currents that attract abundant pelagic species. It's renowned for its historical significance as a prime location for observing schooling scalloped hammerhead sharks. The seamount's central peak is the shallowest at approximately 16m, with the southern peak at around 21m and the northern at 25m, before dropping steeply into deeper waters. These pinnacles are adorned with sea fans, black coral, and offer refuge to schooling fish. The unique topography and current patterns make it a magnet for large marine life, including various shark species, rays, and significant fish aggregations. The marine life here is exceptionally diverse, with scalloped hammerheads being a major draw, especially from August to November. Beyond sharks, divers frequently encounter mobula rays, giant oceanic mantas, and whale sharks. Large schools of amberjack, tuna, wahoo, and dorado are also common, along with resident Panamic green morays. Orcas and dolphins occasionally pass through, adding to the unpredictable and thrilling nature of the site. Typical dives involve a blue-water descent, often encountering strong, shifting currents, and then exploring the seamount structure. Due to its offshore location and exposure, El Bajo is best suited for experienced divers comfortable with challenging conditions. Patience and good buoyancy control are essential for maximizing encounters with the resident and transient pelagic species.

Dive site facts: El Bajo Seamount

Depth

16–40+ m

Typical dive

16–25 m

Current

Strong and variable

Visibility

15–30 m

Water temperature

19–30°C

Entry

Boat / blue-water descent

Level

Advanced to Expert

Dive type

Pelagic, seamount

Region / port

La Paz, Sea of Cortez

Coordinates

24.56, -110.35

Conditions & Currents

El Bajo Seamount is characterized by strong and unpredictable currents, a defining factor of the dive. Currents can vary from gentle to very strong within a single dive, and their direction and strength can shift unexpectedly with the tide. Divers should be prepared for blue-water descents and potentially negative or fast entries as directed by the dive crew. Maintaining a tight group and holding position over the seamount's peaks without disturbing the environment is crucial. Good buoyancy control and efficient air consumption are important, as active currents may require extra effort, and significant marine life encounters often occur at depths that limit bottom time. Visibility is generally good, ranging from 15 to 30 meters, but upwellings that attract marine life can sometimes reduce clarity.

Marine life & sighting chances

Scalloped hammerhead shark

August–November · occasional

Mobula ray

Summer · common

Giant oceanic manta ray

occasional

Whale shark

Occasional · rare

Amberjack

common

Tuna

common

Wahoo

occasional

Dorado

occasional

Panamic green moray eel

common

Sea lion

rare

Dolphin

rare

Orca

rare

Silky shark

occasional

Dive profile & how the dive runs

Diving El Bajo typically begins with a blue-water descent, often requiring a negative or fast entry due to strong currents. Divers aim for the seamount's peaks, the central one topping out at approximately 16m. The dive involves exploring the rugged pinnacles and ridges, staying close to the structure to observe schooling fish and resident moray eels, while keeping an eye on the blue for pelagic encounters. Divers often position themselves slightly off the peak, allowing the current to bring marine life, particularly hammerhead sharks, into view without creating excessive bubbles or commotion. The route progresses along the seamount, often working against or with the current, reaching depths of 25m to 40m for optimal pelagic sightings. The turn point is determined by air consumption and bottom time, considering the deeper average depth and potential exertion from current. Safety stops are conducted in the blue water, with careful monitoring of depth and surrounding marine traffic.

Underwater photography

El Bajo Seamount offers incredible wide-angle opportunities, especially for capturing schooling hammerheads, mobula rays, and massive fish aggregations. A fisheye lens is highly recommended to encompass the vast schools and the dramatic seamount topography. Strong strobes are essential for illuminating subjects in the often deeper, darker water and for achieving dynamic backlit shots against the blue. Due to varying visibility and potential thermoclines, be prepared to adjust your lighting. When photographing hammerheads, maintain neutral buoyancy and avoid aggressive finning; remaining calm and allowing the sharks to approach will yield better shots. Patience is key, as the pelagic action can be unpredictable. Focus on capturing the scale of the schools and the interactions with the seamount structure.

Combine with nearby dive sites

• Los Islotes

  Famous for playful California sea lion encounters, accessible from La Paz.

• La Reina

  A pinnacle known for Panamic green morays and a resident sea lion colony, attracting giant Pacific manta rays.

• Gordo Banks

  Another offshore seamount in the region, also attracting pelagic species and hammerheads.

• San Rafaelito

  An artificial reef near La Paz, offering diverse marine life and typically calmer conditions.

Getting there & logistics

Access to El Bajo Seamount is primarily from La Paz, Baja California Sur, which is served by Manuel Márquez de León Airport (LAP) with international connections. Dive operations typically run day trips by panga, with the seamount located approximately 45 minutes to 8 miles offshore. For an extended experience and access to other remote sites, liveaboards operating from La Paz are a popular choice, especially during the peak pelagic season from July to November. Marine park fees and conservation permits apply and are usually handled by dive operators. Trips often combine El Bajo with other iconic Sea of Cortez sites like Los Islotes or La Reina, creating itineraries focused on large animal encounters. Booking several months in advance is advisable, particularly for liveaboards targeting the peak hammerhead season.

Safety & environment

El Bajo Seamount is an advanced dive site due to strong, unpredictable currents and its offshore location. Divers must be comfortable with blue-water descents, potential negative entries, and maintaining position in current. Excellent buoyancy control and efficient air consumption are paramount. A recompression chamber is available in La Paz. Evacuation procedures from the remote site will involve boat transport back to La Paz and then medical assistance. Comprehensive dive insurance, including coverage for emergency medical treatment and evacuation, is mandatory for all divers. Always dive with experienced operators who provide thorough briefings on current conditions and emergency protocols. Respect marine life by observing from a distance and avoid disrupting their natural behavior, especially schooling sharks.

Who it suits — and who it doesn't

FAQ

El Bajo Seamount FAQ

Liveaboards diving El Bajo Seamount

These liveaboards may visit El Bajo Seamount on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Nautilus Explorer

Mexico

25 guests44.8 m

$230/day

Valentina

Mexico

20 guests38.1 m

$430/day

Rocio del Mar

Mexico

20 guests33.5 m

$392/day

Nautilus Under Sea

Mexico

19 guests32 m

$261/day

Nautilus Belle Amie

Mexico

32 guests44.8 m

$249/day

Quino del Mar

Mexico

20 guests36 m

$392/day

Nautilus Gallant Lady

Mexico

12 guests35.36 m

$332/day