Belflou is a commune in the Aude department in southern France.

Belflou Castle (mainly 13th - 14th centuries) was originally a forcia, i.e. a secondary feudal fortress, probably consisting of a keep that became the south square tower, wooden constructions and the water ditch. At the end of the 13th and beginning of the 14th century, the stronghold was transformed into a fortified castle, the appearance of which will not change much until today. The elements that have disappeared today are a drawbridge to the west, replaced by a small stone bridge, outbuildings in the courtyard, a wooden walkway overhanging the perimeter wall and, perhaps, a second surrounding tower to the northeast. In the early 16th century, the north stair tower was raised and decorated with busts and gargoyles, while its avant-corps was remodeled. In the 17th and 18th centuries, several openings, notably the windows to the south, were enlarged. In the 19th century, the north façade and the upper parts of the east wing were refurbished, while a small bridge was added to the east to access the adjoining land.

Overall, the building and its fortifications are a well-preserved example of late medieval defensive architecture in Lauragais. The castle and its water ditch have been protected as historical monuments since 1948. The site was listed in 1989.

Nearby Lac de la Ganguise (also known as Retenue de l'Estrade) is a lake with a surface area is 2.78 sq km. Halfway between Toulouse and Carcassonne, from March to December, come and discover our different boats: catamaran, dinghy, windsurfing, funboard, paddle, pedal boat, canoe, mountain bike; for hire, lessons, regattas or at school.

With its 280 hectares and 300 days of wind per year with an average force of 4, Lac de la Ganguise is an internationally known windsurfing spot and a privileged resort for practicing water sports.

The club offers, in addition to the usual possibilities of rental, baptism and other initiations, real prospects for development through its internship and teaching formulas. The sailing school and weekend training bring together 30 athletes ready to go out in all weathers. The equipment park consists of a large fleet of 420, 470, Lasers, Hobbie Cat, Optimists, Caravelles as well as many boards of all types.