The line begins as an extension of the LGV Atlantique western branch near Connerré (Sarthe). After a connection north of Le Mans, the LGV dips towards the southwest with a connection to the regular Le Mans-Angers line near Sablé-sur-Sarthe. The connection, at a length of 32 km, from Sablé-sur-Sarthe slightly speeds up the journey to Nantes. The line then rises to pass north of Laval and re-join the regular ligne at Cesson-Sévigné, near Rennes. The total length of the route is roughly 214 km of which 182 km being high speed.