Château de Maubreuil, Heritage château in Carquefou, France.

Château de Maubreuil stands in Carquefou, in the Loire-Atlantique, as a symmetrical stone château behind a broad lawn: a central block under a steep roof with a decorative dormer and railing, flanked by two identical wings with tall roofs, dormer windows and chimneys. Tall rectangular windows run in regular rows across three levels, and the central arched entrance door is reached by a short flight of steps. A separate round tower with a domed roof and small lantern, partly covered by ivy, stands to the right. It now holds a five-star hotel with fourteen rooms and suites, three apartments, a Cinq Mondes spa and the restaurant La Table du Marquis.

The castle was built in 1815 by Felix Cossin, a wealthy merchant and shipowner from Nantes, replacing an earlier structure destroyed during the French Revolution. Its construction came during a time when the region was recovering and trade was reviving after years of upheaval.

The estate's name was written Maubreil before the French Revolution. A chapel dedicated to Saint Anne was founded on the domain on 25 December 1671 by Michel Ménardeau. The restaurant, La Table du Marquis, serves cuisine inspired by travel, and its wine list, the Cave du Marquis, was selected in 2025 among France's hundred best wine and spirits lists at the Trophée Tour des Cartes.

The estate sits near Nantes and is surrounded by grounds worth exploring on foot. Visitors should plan time to walk around the different buildings and areas, including the chapel and hunting lodge, as they are spread across the property rather than clustered together.

The sanatorium in the park was built after the marquis de Dion ceded the estate to the department in 1934; its buildings were inaugurated in 1938 and from 1972 housed a functional rehabilitation centre. The château itself, bought in 2012 by the Nantes entrepreneur Philippe Rousse, was restored over seven years and opened as a five-star hotel on 12 December 2019.