Cabo Douglas

The only place on Earth to dive with marine iguanas — Fernandina’s volcanic reef where prehistoric-looking reptiles feed on algae at arm’s length in frigid upwelling waters.

Overview

Cabo Douglas sits on the northwest coast of Fernandina, the youngest and most volcanically active island in the Galápagos — and one of the most pristine environments on the planet, having never suffered invasive species. This is the signature marine iguana dive: the world’s only sea-going lizards descend from the lava shoreline to graze on green and red algae at 3–7 meters depth, staying submerged 5–10 minutes per feeding dive. Larger males dive deeper than females. The site also has a deeper zone (20–33 meters) where endemic red-lipped batfish walk across the volcanic substrate on modified fins. Water is cold — the Cromwell Current upwelling from the deep Pacific brings temperatures down to 13–18°C — making this the coldest dive on most Galápagos liveaboard itineraries.

Site Information

• Location: Fernandina Island (Isla Fernandina), northwest coast, Galápagos Islands
• Entry Type: Boat dive
• Site Type: Reef
• Difficulty Level: Advanced
• Maximum Depth: 33 meters
• Typical Visibility: Variable; poor near shore due to surge, improving at depth
• Current: Negligible at the site, but significant surge near shore
• Water Temperature: 13–18°C (55–65°F) — the coldest dive in the Galápagos
• Best Time: Marine iguanas enter the water most reliably 11:00 AM – 2:00 PM

Marine Life

Galápagos marine iguanas (Amblyrhynchus cristatus) are the signature encounter — the only marine lizards on Earth, feeding on algae at 3–7 meters in a display that feels like diving with dinosaurs. Red-lipped batfish (Ogcocephalus darwini), an endemic species found nowhere else, walk across the deeper volcanic substrate at 20–30 meters. Pacific seahorses are described as “aplenty” in the deeper sections. Galápagos penguins and flightless cormorants — both endemic — are seen in and around the water. Galápagos hornsharks (Heterodontus quoyi) are present in the cold-water western island zone and have been reported at Fernandina-area sites. Sea lions are playful and abundant. Green sea turtles, small stingrays, and frogfish (multiple species) inhabit the reef. Chocolate chip sea stars dot the substrate.

Dive Profile

Liveaboards typically schedule two dives at Cabo Douglas: a shallow iguana dive (3–10 meters, best between 11:00 AM and 2:00 PM when iguanas feed) and a deeper dive (20–33 meters) targeting batfish, seahorses, and benthic species. The shallow zone is algae-covered lava rock — the marine iguana feeding ground. The deeper zone transitions to rocky slopes with corals, sponges, and gorgonians. Dives tend to be short (28–48 minutes) due to the cold. The early morning start (6:00–6:30 AM) common on liveaboard itineraries targets the deeper zone before the iguanas become active later in the morning.

Entry and Exit

Access by panga from the liveaboard only. Divers are dropped in buddy pairs near shore. Due to surge and rocky terrain, swimmers may need to swim out to the panga for pickup after surfacing. Entry conditions can be challenging close to shore where swell is high.

Tips

• Bring maximum thermal protection — 7mm wetsuit minimum, many divers use drysuits or 9mm+ with doubled gloves
• No strobe photography is permitted during marine iguana dives to avoid disturbing the animals
• Plan the shallow iguana dive for late morning/early afternoon when iguanas are most active in the water
• Nitrox helps maximize the limited bottom time in cold water at depth
• Look carefully at the deeper substrate for batfish — they are well-camouflaged and easy to miss

Safety

The primary hazard is cold — water temperatures of 13–18°C can cause rapid heat loss and shortened dive times. Hypothermia risk is real without adequate exposure protection. Surge near shore is significant and visibility in the shallows can be poor. While currents at the site itself are minimal, the remote liveaboard-only location means medical facilities are far away. Monitor your core temperature and end the dive if you begin shivering.

Sources: LiveAboard.com – Cabo Douglas, Galapatours – Cape Douglas, DeepBlueCoast – Cabo Douglas Liveaboard, X-Ray Mag – Diving with Galapagos Marine Iguanas. GPS coordinates contributed by ScubaBoard user Dan. Last updated 2026-05-30.