In the reservoir El Burguillo in the province of Ávila the private island Isla Centinela is listed for sale. According to the agency marketing it, CENTURY 21 Homeplace the asking price is €3.25 million. The property comprises an island of just over 10,000 square metres and a castle built in 1923 on an older watchtower site, which the listing says has been fully renovated. The listing details are dated 8 October 2026.
The castle is described as having four levels, an internal lift and around 1,000 square metres of gross floor area. The listing mentions seven suites and a total of eleven bathrooms. It highlights large windows, several panoramic terraces and turrets with battlements inspired by medieval architecture. The grounds are also said to include a spacious function pavilion with a bar, a private boat mooring and small coves. The marketing describes the infrastructure as largely energy self-sufficient, including through photovoltaics, emergency generators and an independent water treatment system. These features are based on the listing’s information.
Isla Centinela lies in the mountain region of the Sierra de Gredos. The El Burguillo reservoir is fed by the Alberche and extends along the municipalities of El Tiemblo, El Barraco and Navaluenga. Access to the island is usually possible only by boat; the area is considered scenic and is well known to tourists. Independent property portals have picked up the key details of the offer and classify the property as a luxury home. The listings do not include independent official documents on its legal status.
The specific conditions applying to islands in reservoirs in Spain are relevant to potential buyers. These include water-law responsibilities, possible environmental restrictions, rules on resource use, and questions of access and long-term use. The current listing does not specify any permits or restrictions in detail. The uses that may be permitted on a long-term basis in each case depend on the competent authorities and must be clarified before purchase.
Marketing such an exposed property could fuel debate about the treatment of sensitive landscapes and exclusive leisure properties in the province of Ávila. No reliable conclusions can currently be drawn about how the sale will proceed, potential buyers or future plans for its use. What is clear is that Isla Centinela has come onto the market as a rare offering in a sought-after lakeside location; the stated features and area figures are based on the published marketing materials.
Editor: Mira Cadena (Article created with AI assistance).