Montech is a commune in the Tarn-et-Garonne department in the Occitanie region in southern France. On the Canal de Garonne is th…Montech is a commune in the Tarn-et-Garonne department in the Occitanie region in southern France. On the Canal de Garonne is the unique Montech water slope, a type of canal inclined plane built in 1974. The slope has been out of service since an engine failure in 2009.