Threshold of Naurouze
See also: Threshold
The Threshold of Naurouze , sometimes also called threshold of the Lauragais, is a threshold (or collar) of 189 meters of altitude of the south-west of the France located at the border of the department of the Haute-Garonne and the Department of the Aude on the Watershed between the Atlantic Ocean and the Mediterranean, it constitutes the highest point of the Canal of the South, which makes it possible to connect the Mediterranean to the Atlantic, and separates the Massif Central (in north), of the the Pyrenees (in the south).
History
This threshold is known since antiquity. Strabon, Greek Géographe had called this passage the Isthme Gaulois, and the Via Aquitania , Roman Voie connecting Narbonne to Toulouse passed there.
It is the angular stone of Pierre-Paul Riquet in the construction project of the Canal of the South. Indeed, it is the highest point of the course which requires a contribution out of continuous water to feed the channel. Engineer Riquet with the idea to collect water of the Black Mountain and to bring them until the threshold. It makes build the Lac of Saint-Ironwood close to Revel and the drain of the Plain which brings water since the lake to the channel to the threshold of Naurouze.
In 1825, the heirs to Riquet make set up a Obélisque with the threshold of Naurouze to mark the symbolic system of the place. It is set up close to the site of the old abandoned hexagonal tank a few years after the construction of the channel because of its recurring stranding. The obelisk has a dedication: With Pierre-Paul Riquet, baron de Bonrepos, author of the channel of the Two Seas in Languedoc .
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