The Jebble-Vanquo-Tarnith line was a boundary between Galactic Republic and Neo-Crusader forces in the Outer Rim in 3964 BBY, during the Mandalorian Wars. It was likely formed in 3966 BBY as a result of Lhosan Industries lobbying the Republic to defend Taris's resource worlds.
The line was located near the planets of Taris, Jebble, Vanquo and Tarnith. Republic Navy Captain Saul Karath was responsible for a portion of the line, as was Admiral Jimas Veltraa.