[nolok]

In France, we don't have direct TGV lines to every places, only major lines, see http://about-france.com/photos/tgv-route-map2.jpg (note that this is a couple years old now).

The rest of the network is covered by lower speed and maintenance TER lines (here for full network: https://www.bonjourlafrance.com/wp-content/uploads/2016/04/F...)

Those connect local/regional points and make sense on a regional level, then get connected to the TGV network for the national level.