Landes is one of the original 83 departments that were created during the French Revolution on 4 March 1790. It was created from parts of the provinces of Guyenne and Gascony.

During the first part of the nineteenth century large parts of the department were covered with poorly drained heathland ( in French) which is the origin of its name. The vegetation covered rich soil and was periodically burned off, leaving excellent pasturage for sheep, which around 1850 are thought to have numbered between 900,000 and 1,000,000 in this area. The sheep were managed by shepherds who moved around on stilts and became proficient at covering long distances thus supported. Most of the sheep departed during the second half of the nineteenth century when systematic development of large pine plantations transformed the landscape and the local economy.

The Nobel Prize–winning novelist François Mauriac set his novels in the Landes.

Landes is part of the current region of Nouvelle-Aquitaine and is surrounded by the departments of Gironde, Lot-et-Garonne, Gers, and Pyrénées-Atlantiques, as well as the Atlantic Ocean on the west. With an area stretching over more than 9000 km², Landes is, after Gironde, the second largest department of the metropolitan French territory.

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