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Chiloé Island
What is Chiloé Island, and where is it?
Chiloé Island is the largest island completely within Chile, located off the country's western coast in the Los Lagos Region. This 8,394-square-kilometer island sits in the Pacific Ocean, separated from the mainland by the Chacao Strait and two gulfs, and is known for its wooden churches and temperate rainforests.
Location and Physical Shape
Chiloé Island lies 190 kilometers from north to south and averages 55 to 65 kilometers wide, forming a roughly rectangular mass in the Pacific. The Chacao Strait separates it from mainland Chile to the north, while the Gulf of Ancud and Gulf of Corcovado border it to the east. The Chonos Archipelago extends southward across the Boca del Guafo. At 8,394 square kilometers, it ranks as the second-largest island in Chile overall and the fourth-largest in South America.
The island's geography reflects its position as a southern extension of the Chilean coastal range. Mountains run north to south along its spine—the Cordillera del Piuchén in the north and the Cordillera de Pirulil in the south. The southwestern half consists of dense forests and swamps, while the northeastern sectors feature rolling hills with pastures and cultivated fields. The western shores are rocky and relatively straight, whereas the eastern and northern coasts are deeply indented with numerous inlets, bays, and peninsulas where settlements cluster.
Climate and Rainforest Ecology
Chiloé experiences a humid, cool temperate oceanic climate with Mediterranean precipitation patterns. The western side receives substantial rainfall and hosts the Valdivian temperate rainforest, one of the world's few temperate rain forests. The eastern shore, sheltered by interior mountains, is warmer and drier. Chiloé National Park on the western shore and Tantauco Park on the southern shore protect portions of this coastal range ecosystem.
Marine life thrives in the island's northwestern waters. Blue whales, sei whales, Chilean dolphins, and Peale's dolphins inhabit these seas alongside sea lions and marine otters. The Islotes de Puñihuil Natural Monument, a group of three islets northwest of Puñihuil, serves as the only known shared breeding site for Humboldt and Magellanic penguins. The Alfaguara project, based at Puñihuil, combines long-term cetacean research with educational programs and sustainable development initiatives for local communities.
Wooden Churches as Architectural Heritage
Chiloé's most distinctive feature is its collection of wooden churches built without nails, representing a fusion of indigenous and European architectural traditions. Jesuit missionaries arrived at the turn of the 17th century and constructed chapels throughout the archipelago. By 1767, 79 churches existed; today more than 150 wooden churches in traditional style stand on the islands. Many have been declared UNESCO World Heritage Sites, preserving a unique architectural legacy that emerged from the island's colonial history and isolation.
The churches reflect the religious mission that shaped Chiloé's development. After the Jesuits' expulsion in 1767, the Franciscans assumed responsibility for evangelization from 1771 onward. These structures dot the landscape of towns including Castro, Ancud, Dalcahue, and Chonchi, serving as physical reminders of centuries of spiritual and cultural continuity on the island.
Early Settlement and Spanish Colonization
Human habitation of Chiloé extends back more than 7,000 years. Archaeological middens scattered along the coast contain mollusc shells, stone tools, and bonfire remains, indicating that nomadic groups collected marine creatures such as clams, mussels, and Choromytilus chorus while hunting and fishing. When Spanish conquistadores arrived in the 16th century, the Chono, Huilliche, and Cunco peoples inhabited the island, navigating its treacherous waters in boats called dalcas.
Alonso de Camargo first sighted Chiloé's coast in 1540, but Francisco de Ulloa, who reached the Chacao Channel in 1553 during an expedition ordered by Pedro de Valdivia, is considered the first European discoverer. García Hurtado de Mendoza's 1558 expedition led to the archipelago being claimed for Spain. Castro was founded in 1567. The Spanish originally called the island New Galicia, but the name Chiloé, meaning 'place of seagulls' in the Huilliche language, eventually prevailed.
Industrial Development and Modern Integration
Chiloé remained isolated from mainland Chile until 1826, eight years after Chilean independence and following two failed independence campaigns. From 1843 onward, many Chilotes migrated to Patagonia seeking work, particularly in Punta Arenas, though this migration gradually decreased as conditions improved locally. The 19th century brought foreign whalers, particularly French vessels, to the island's waters.
From the mid-19th century until the early 20th century, Chiloé became the continent's main producer of railroad ties. This industry spurred the establishment of new towns including Quellón, Dalcahue, Chonchi, and Quemchi. From 1895, European settlers and manufacturing industries received land grants. The construction of a railroad between Ancud and Castro in 1912 facilitated inland occupation, though this line is no longer operational. In 2012, LAN Airlines inaugurated the first regular air service between Puerto Montt and Mocopulli airport in Dalcahue, ending the island's reliance on ferry access across the Chacao Strait.
Where is Chiloé Island?
Chiloé Island is in Chile, South America, at 42.68°S, 73.99°W. The closest places in the Terravel atlas are Cueva de las Manos (562 km), Atacama Desert (2,067 km) and Iguaçu National Park (2,596 km).
Photos of Chiloé Island
Photo: E10ddie · CC BY-SA 4.0
Photo: Joanna (JCardinal18) from Washington, DC, USA · CC BY 2.0
Photo: Michelle Maria · CC BY 3.0
Chiloé Island at a glance
Questions about Chiloé Island
How large is Chiloé Island?
Chiloé Island covers 8,394 square kilometers, making it the second-largest island in Chile and the largest island completely within the country. It measures 190 kilometers from north to south and averages 55 to 65 kilometers in width.
What are the main towns on Chiloé Island?
Castro, located on the east side, serves as the island's capital. Ancud sits at the northwest corner as the second-largest town. Smaller port towns on the east coast include Quellón, Dalcahue, and Chonchi. All settlements cluster along the indented eastern and northern shores.
When did Chiloé become part of Chile?
Chiloé only became part of the Chilean republic in 1826, eight years after Chile's independence. Two failed independence campaigns occurred in 1820 and 1824 before the island's integration into the new nation.
What marine species inhabit Chiloé's waters?
Blue whales, sei whales, Chilean dolphins, and Peale's dolphins live in Chiloé's northwestern waters. Sea lions, marine otters, Magellanic penguins, and Humboldt penguins also inhabit the area. The Islotes de Puñihuil serves as the only known shared breeding site for Humboldt and Magellanic penguins.
How can visitors reach Chiloé Island?
Since 2012, LAN Airlines offers regular flights between Puerto Montt and Mocopulli airport in Dalcahue. A small airstrip at Inío on the island's south tip opened in 2013. Previously, ferry service across the Chacao Strait was the only access route.
Sources and further reading
This article was written from the reference material below, retrieved and reviewed for source alignment on September 13, 2026. Use official local sources for changing access or travel information.
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Test yourself
Which Pacific island is famous for UNESCO-listed wooden churches built entirely without nails?
Chiloé Island's distinctive wooden churches, constructed without a single nail and blending Mapuche and Spanish colonial traditions, are UNESCO World Heritage sites found nowhere among the other options.
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