Threshold of Naurrouse

The Seuil de Naurouze, or Col de Naurouze, is the highest point (190 m above sea level) of the Canal du Midi in southern France. It is the watershed point identified by Pierre-Paul Riquet when he designed and built the canal. Water falling on the western side of this point flows to the Atlantic Ocean and on the eastern side to the Mediterranean Sea.

The Bassin de Naurouze is an octagonal holding tank, created during the building of the Canal du Midi as designed and built by Pierre-Paul Riquet. It was abandoned a few years after construction of the canal because of its recurrent silting problems. The flow of water from the Bassin de Saint-Ferréol joins the Canal du Midi at this point near the Seuil de Naurouze.

The Riquet Obelisk (French: Obélisque de Riquet) is dedicated to the creator of the Canal du Midi, Pierre-Paul Riquet. In 1827, the heirs of Riquet built the monument. The obelisk has a dedication: "To Pierre-Paul Riquet, Baron Bonrepos, author of the Two Seas Canal in Languedoc". It is erected near the site of the former octagonal holding tank, called the Bassin de Naurouze, created during the building of the Canal du Midi.

The Vasague Aqueduct (French: Aqueduc de Vasague) is one of several navigable aqueducts on the Canal du Midi. It is quite near the Seuil de Naurouze, and crosses a small stream, Le Fresquel.