The Canal du Midi (Occitan: Canal de las Doas Mars, meaning canal of the two seas) is a 241 km (150 mi) long canal in Southern France (French: le Midi). It was originally named the Canal royal en Languedoc (Royal Canal in Languedoc) but the French revolutionaries renamed it to Canal du Midi in 1789. It was considered at the time to be one of the greatest construction works of the 17th century.
The canal connects the Garonne River to the Étang de Thau on the Mediterranean and along with the 193 km (120 mi) long Canal de Garonne forms the Canal des Deux Mers joining the Atlantic to the Mediterranean. The canal runs from the city of Toulouse down to the Étang de Thau near the Mediterranean.