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The official channel of the France 3 show. C'est pas sorcier, the magazine of discovery and science. The Landes de Gascogne forest, one of the largest in Europe, has been entirely shaped by the hand of man. Fred, Sabine and Jamy explain everything about its history, its exploitation and its preservation. Today, the kingdom of maritime pine, the forest has not always presented this green face: marshy and unhealthy lands once stretched as far as the eye could see. We discover with the C'est pas sorcier team how, from 1857, we managed to develop this formerly barren moorland that we used to travel perched on stilts. In which departments does the Landes de Gascogne forest extend? Why is the ground covered with very fine sand across the entire Landes triangle? Where does the dune line that borders the entire forest come from? Why are there many ponds and wetlands behind these dunes? How were the dunes fixed to prevent them from invading the interior? What is the technique for logging in the Landes forest?