Island

Isabela Island

Isabela is the largest island in Galápagos and a territory defined by six volcanoes, lava fields, nutrient-rich western coasts, and a human history linked to Puerto Villamil.

Its geographic scale makes control of introduced species and protection of vulnerable species central challenges for conservation in the archipelago.

A large-scale volcanic island

Isabela is the largest island in the Galápagos archipelago and contains some of its most representative geological and ecological landscapes. Its shape, associated with the merging of large volcanoes, brings together lava fields, highlands, western coasts, and marine environments whose diversity depends on volcanic and oceanic processes in continuous transformation.

Essential information

Area: 4,711 km²
Population: 3,000 inhabitants
Maximum elevation: 1,707 m

Six volcanoes, one island

Isabela formed through the merging of six shield volcanoes: Ecuador, Wolf, Darwin, Alcedo, Sierra Negra, and Cerro Azul. Wolf Volcano reaches the archipelago's highest elevation, while Sierra Negra, the tuff cones of Tagus Cove, and the uplift at Urbina Bay reveal the force of the processes that shaped the island.

The extensive, relatively recent lava fields and still-developing soils produce a vegetation pattern distinct from that observed on other large islands. Southern highlands contrast with coastal areas, arid landscapes, and western environments influenced by cold, nutrient-rich waters.

Territorial history

1684Ambrose Cowley named the island Albemarle in honor of the Duke of Albemarle. The name Isabela was later associated with Isabella I of Castile.
1835Charles Darwin visited Tagus Cove, an inlet that pirates, buccaneers, and whalers had used as a protected anchorage.
1893Antonio Gil colonized southern Isabela and founded Puerto Villamil on the coast; Santo Tomás in the highlands later became associated with sulfur extraction, agriculture, and livestock.
1944–1959Isabela housed a penal colony. The Wall of Tears was built during this period by people deprived of liberty.
Late twentieth century and present dayPuerto Villamil became the island's main population center in a territory where fishing, agriculture, tourism, and conservation remain closely connected.

Puerto Villamil and inhabited territory

Puerto Villamil, on the south coast, is Isabela's main settlement and a meeting point among community, coast, and protected areas. Fishing, agriculture, and tourism have formed part of its development, while nearby lagoons and wetlands show the continuity among urban life, brackish environments, and coastal biodiversity.

The highlands, historically associated with Santo Tomás and the slopes of Sierra Negra, express another dimension of the territory. They concentrate references to agriculture, former resource use, and landscapes where higher-elevation vegetation contrasts with lava fields and the coast.

Conservation at island scale

Isabela's scale amplifies challenges present on other Galápagos islands. Introduced species have modified ecosystems and threatened populations of giant tortoises, birds, and small reptiles. Restoration requires long-term intervention, scientific monitoring, and coordination among institutions and local communities.

Project Isabela removed introduced goats and donkeys from the north of the island as part of an ecological-restoration process. However, cats and rats continue to threaten vulnerable fauna. Species associated with these challenges include the mangrove finch, the Galápagos penguin, and the flightless cormorant.

Landscapes and territorial references

Puerto Villamil and the wetlands

Puerto Villamil and its nearby wetlands bring together beaches, brackish lagoons, mangroves, and coastal wildlife. This setting helps explain how terrestrial and marine environments relate to Isabela's main human settlement.

Sierra Negra and the volcanic system

Sierra Negra is one of Isabela's most visible geological references. Its caldera and nearby volcanic landscapes show the scale of the volcanoes that merged to form the island and continue to define its terrain.

Urbina Bay and Project Isabela

Urbina Bay is known for the geological uplift that modified its coastal strip in the middle of the twentieth century. The area also situates Project Isabela in the territory where restoration in response to introduced mammals became connected to the protection of giant tortoises and other island ecosystems.

Tagus Cove and the western coast

Tagus Cove brings together references to historic navigation, tuff cones, and western coastal landscapes. Together with other western areas of Isabela, it forms part of a marine environment influenced by cold, nutrient-rich waters that sustain a broad diversity of life.

Punta Vicente Roca and the Bolívar Channel

Isabela's western coast and the Bolívar Channel reflect the influence of ocean currents that enrich the waters of the western archipelago. These conditions connect the island's geology with marine ecosystems relevant to birds, fish, and marine mammals.

Place
Pearl Shell
Pearl Shell is a small lagoon of calm, clear saltwater next to the Puerto Villamil dock, on Isabela island. Volcanic rock formations shelter it from the open sea, and red, black, white, and button mangroves surround it. It is reached on foot along a wooden boardwalk that crosses the mangroves and ends at a small platform from which visitors enter the water. Snorkelling and swimming are the activities of the place. Galápagos sea lions, sea turtles, marine iguanas, tropical fish, rays, and Galápagos penguins may appear in the lagoon or on the platform, always as a possibility. The marine iguana is endemic to Galápagos, and the tortuga prieta is the archipelago's green turtle. The visit takes place within the protected area: not touching or disturbing the animals and keeping a distance is the expected conduct.
Place
Wall of Tears
The Wall of Tears is a historical site on Isabela island, west of Puerto Villamil. It is a long wall of lava blocks that the prisoners of the Isabela penal colony raised by hand in the mid-twentieth century, with no purpose other than keeping them busy in exhausting forced labour that cost lives. Today it is a place of memory that recalls a period of cruelty in the human history of the archipelago. It is reached by a trail that leaves Puerto Villamil, passes the town cemetery, crosses the southern Isabela wetlands, with white-sand beaches, lagoons, and mangroves, and continues through the dry zone to the wall. Steps climb to the Cerro Radar viewpoint, with a wide view of the coast. Along the way, giant tortoises, marine iguanas, shorebirds, and Darwin's finches may appear, always as a possibility.
Place
Arnaldo Tupiza Tortoise Breeding Centre
The Arnaldo Tupiza Tortoise Breeding Centre, on the outskirts of Puerto Villamil on Isabela island, is where the Galápagos National Park authority breeds and rears in captivity the giant tortoises of the south of the island: the Sierra Negra tortoise, Chelonoidis guntheri, and the Cerro Azul tortoise, Chelonoidis vicina. Eggs are incubated at the centre, hatchlings grow in pens under conditions similar to the wild during their first years, the most vulnerable ones, and the young tortoises later return to the volcanoes they come from. Tortoises of all ages, from hatchlings to breeding adults, can be seen in the pens. It is reached on foot by an interpretive trail that leaves Puerto Villamil and crosses wetlands, lagoons, and dry forest, where flamingos, waterbirds, and marine iguanas may appear, always as a possibility.
Place
Cerro Azul Volcano
Cerro Azul Volcano rises at the far southwestern end of Isabela island, southwest of Sierra Negra, and is one of the most active volcanoes of the archipelago. Its broad, gentle slopes climb to a broad summit caldera, in a great dark dome moulded by solidified lava flows and cinder cones. The effusive eruptions of this basaltic volcano have poured lava from the caldera and from fissures on its flanks, and the young lava fields contrast with the mountain's older structure. The visit does not reach the volcano: it is admired from the designated trails of the nearby sites and from the sea, where the neighbouring landscape of Punta Moreno shares the same volcanic belt. On the slopes live, as ecological context, the giant tortoise, the land iguanas, and the lava lizards, and the waters of the west coast, fed by a cold, deep current, sustain abundant marine life.
Place
Sierra Negra Volcano
Sierra Negra Volcano, on Isabela island, is one of the six shield volcanoes whose lava flows merged to form the island. Its name refers to the dark colours of the old lava fields, and its broad caldera, with a shallow floor, figures among the largest calderas in the world. The visit climbs from the island's highlands to the rim of the caldera, which is walked with open views over the interior, where young flows appear as dark patches against the lighter terrain. On the volcano's flank, the Volcán Chico area shows landscapes of young lava almost without vegetation and fumaroles that reveal the volcanic activity of the site. On clear days, the view reaches other volcanoes of Isabela and Fernandina island, while the highlands sustain finches, mockingbirds, and, as ecological context, the giant tortoise.

Sources

01Colaboradores de Wikipedia
Isla Isabela
WikipediaAccessed 2026-09-08
02Galápagos Conservancy
Isabela Island
Galápagos ConservancyAccessed 2026-09-08
03Galapagos Conservation Trust
Isabela
Galapagos Conservation TrustAccessed 2026-09-08
04Dirección del Parque Nacional Galápagos
Parque Nacional Galápagos
Parque Nacional GalápagosAccessed 2026-09-08
05Happy Gringo
Isla Isabela Galápagos
Happy GringoAccessed 2026-09-08

A large-scale volcanic island

Essential information

Six volcanoes, one island

Territorial history

Puerto Villamil and inhabited territory

Conservation at island scale

Landscapes and territorial references

Puerto Villamil and the wetlands

Sierra Negra and the volcanic system

Urbina Bay and Project Isabela

Tagus Cove and the western coast

Punta Vicente Roca and the Bolívar Channel

Related places

Pearl Shell

Wall of Tears

Arnaldo Tupiza Tortoise Breeding Centre

Cerro Azul Volcano

Sierra Negra Volcano

Sources