Enceinte médiévale de Castets, Medieval fortification near Bougue, France

The enceinte médiévale de Castets is a medieval fortification set on a plateau between two rivers near Bougue, in southwest France. The site covers a large area with noticeable changes in elevation, earthen mounds, and visible traces of several construction phases.

The plateau was already occupied in prehistoric times and continued to be used through the medieval period. In the 13th century, the site was chosen for the creation of a new town, but the project was abandoned before it was finished.

The name Castets comes from a Latin word meaning small castle, which points directly to the original purpose of this fortified post. The site sits on the border between the Landes region and Gascony, a boundary that shaped how people here lived and moved for centuries.

The site is freely accessible and has marked trails and information panels to help visitors find their way around. The ground is uneven in places, so sturdy footwear is a good idea before heading out.

The bastide of Castetcrabe, meaning "castle of the goats", was ordered in 1275 by King-Duke Edward I of England but never completed. No trace of it survives, likely because the site lay too far from trade routes and the viscount and viscountess of Marsan, who had not been consulted, pressured the surrounding population against it.