The Tawachiche River watershed covers 196 km² and is the ninth largest sub-watershed in the Batiscanie [REF].
River Tawachiche pass through a single village, Hervey-Jonction, then crosses Rang Saint-Charles and empties into the Batiscan River (which forms a sharp bend at this point), at the limit Sainte-Thècle and Lac-aux-Sables.