Mosquera

A sandy channel between North Seymour and Baltra where a large sea lion colony turns every dive into an underwater circus of playful interactions.

Overview

Mosquera is a sand and rock islet in the channel between North Seymour and Baltra Islands, home to one of the largest sea lion colonies in the central Galapagos. The dive site features a sandy bottom with scattered rock formations, creating a relatively mellow environment compared to the Galapagos’ more demanding current-swept sites. The main attraction is the sea lion colony — dozens of animals that treat divers as entertainment, swooping, spinning, and blowing bubbles at close range. The sandy substrate also supports garden eels, rays, and reef sharks.

Site Information

• Location: Channel between North Seymour and Baltra Islands, Galapagos Islands
• Entry Type: Boat dive
• Site Type: Reef
• Difficulty Level: Advanced
• Maximum Depth: 27 meters
• Typical Visibility: 10-20 meters (30-65 feet)
• Current: Mild to moderate
• Best Time: Year-round; sea lions are always present

Marine Life

Galapagos sea lions dominate this site, with juveniles and adults alike engaging with divers in extended, playful encounters — mirroring movements, blowing bubbles face-to-face, and performing acrobatic spins. Garden eels sway from the sandy bottom in large colonies, disappearing into their burrows as divers approach. Stingrays and eagle rays cruise over the sand flats. Whitetip reef sharks rest under rock ledges. Schools of reef fish — including surgeonfish, parrotfish, and king angelfish — congregate around the scattered rock formations. Sea turtles graze on algae on the rocks. Spotted moray eels and octopus hide in the rocky substrate.

Dive Profile

The dive is relatively straightforward by Galapagos standards. Entry leads to a sandy slope descending gradually to 20-27 meters. The scattered rock formations provide structure and marine life concentration points along the way. The garden eel colonies are found on the sandy flats between rock formations. Most of the sea lion interaction happens in the 5-12 meter range as divers ascend along the slope. The shallow sandy areas near the islet provide the best sea lion encounters. Safety stop is easily performed in the calm shallows.

Entry and Exit

Short panga ride from a day boat or liveaboard anchored in the channel. Giant stride entry into relatively calm water. The sheltered channel location means surface conditions are usually manageable. The dive is typically a gentle drift or swim along the sandy slope. Exit via direct pickup by panga, or SMB deployment if current has carried divers from the entry point.

Tips and Recommendations

• Spend the majority of your dive time in the shallows (5-12 meters) where sea lion interactions are most frequent and prolonged
• Approach garden eel colonies very slowly and low to the bottom — they retract quickly if startled
• Despite the calmer conditions, this is still the Galapagos — carry full safety equipment including SMB and signaling devices
• Morning dives tend to have the most active sea lions; by afternoon they often haul out to rest on the islet
• Resist the urge to touch or chase the sea lions; staying still and letting them approach produces the best encounters

Safety Considerations

While this is one of the gentler Galapagos dive sites, currents in the channel can pick up unexpectedly, especially during tidal changes. The Advanced rating reflects Galapagos conditions overall — water temperatures of 18-24°C, distance from medical facilities, and the potential for conditions to shift mid-dive. Bull sea lions can be territorial, especially during breeding season (June-September); maintain distance from large males and follow your guide’s direction. Standard thermal protection (5-7mm) is required.

Photography

Sea lion portraits and interaction shots are the main photographic draw. Use a wide-angle or fisheye lens and get close — the sea lions will oblige by approaching to within centimeters. Eye-level shots produce the most engaging portraits. Garden eel colonies make excellent macro or mid-range subjects, but require patience and a slow, low approach. The sandy bottom provides a clean, uncluttered background for ray and shark shots. Ambient light is usually sufficient in the shallows, but strobes help with sea lion portraits to bring out the texture of their fur and the sparkle in their eyes.

Sources: Scuba Iguana – Mosquera North, The Portuguese Traveler – North Seymour & Mosquera, Galapatours – Mosquera Diving, Starfish.ch – Central Galapagos Dive Sites. Last updated 2026-05-30.