Chiloé Province in the context of "Provinces of Chile"

Castro is a city and commune on Chiloé Island in Chile. Castro is the capital of the Chiloé Province in the Los Lagos Region. The city is located on Estero de Castro on the eastern coast of central Chiloé Island. This position provides Castro with a good access to the eastern islands of Chiloé Archipelago as well as to the open ocean through Cucao and Huillinco to the west.

The Chiloé Archipelago (Spanish: Archipiélago de Chiloé, pronounced [tʃiloˈe], locally [ʃiloˈe]) is a group of islands lying off the coast of Chile, in the Los Lagos Region. It is separated from mainland Chile by the Chacao Channel in the north, the Sea of Chiloé in the east and the Gulf of Corcovado in the southeast. All islands except the Desertores Islands form Chiloé Province. The main island is Chiloé Island. Of roughly rectangular shape, the southwestern half of this island is a wilderness of contiguous forests, wetlands and, in some places, mountains. The landscape of the northeastern sectors of Chiloé Island and the islands to the east is dominated by rolling hills, with a mosaic of pastures, forests and cultivated fields.

The archipelago is known within Chile for its distinctive folklore, mythology, potatoes, cuisine and unique architecture. The culture of Chiloé is the result of mixing of Huilliche, Spanish and Chono influences in centuries of isolation without much contact with the rest of Chile or the Western World. Its cool temperate climate, abundance of sea resources and large and lush forests have also played a major role in shaping life in the islands.

Los Lagos Region (Spanish: Región de Los Lagos pronounced [los ˈlaɣos], lit. 'Region of the Lakes') is one of Chile's 16 regions, which are first order administrative divisions, and comprises four provinces: Chiloé, Llanquihue, Osorno and Palena. The region contains the country's second-largest island, Chiloé, and the second-largest lake, Llanquihue. Its capital is Puerto Montt; other important cities include Osorno, Castro, Ancud, and Puerto Varas. Los Lagos Region is considered part of Patagonia.

Historically, the Huilliche have called this territory between Bueno River and Reloncaví Sound Futahuillimapu, meaning "great land of the south". The region hosts Monte Verde, one of the oldest archaeological sites of the Americas. The largest indigenous group of the region are the Huilliche who lived in the area before the arrival of the Spanish. The Spanish crown settled Chiloé Archipelago in 1567 while the rest of the region begun to be slowly colonized by non-indigenous people only in the late 18th century. In the 1850s, Germans arrived to colonize the shores of Llanquihue Lake under a Chilean state-sponsored program.

Estero de Castro is a 20 km long inlet of the Sea of Chiloé into Chiloé Island. Castro, the capital of Chiloé Province is located on its western shores.

Desertores Islands are a group of islands in the Sea of Chiloé, between Chiloé Island and the mainland of Chile. They are the easternmost islands of the Chiloé Archipelago, and are administered as part of the Chaitén commune, in the Palena Province, unlike the rest of the Archipelago, which forms Chiloé Province. The six main islands are Auten, Chuit, Chulin, Imerquiña, Nayahue and Talcan, with Talcan, the biggest and easternmost of the Desertores Islands, close to the mainland. There are several smaller islands in the archipelago. The islands are home to small, isolated communities that rely primarily on fishing and subsistence agriculture.