The great joy of travelling to Avignon by Eurostar/TGV is to see France changing from a northern European country, to a southern one, before your very eyes.
TGVs are two storey trains and I would suggest trying to book an upstairs seat to have the best views. A simple map of France is useful, to identify the regions and places as you whiz through them. When you get to Avignon you will find the TGV station is outside the town, but regular buses go to the centre, stopping near the SNCF station.
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