>>1196948It depends on the season, but I recommend you the Uetsu main line(羽越本線=Uetsu-Hon-sen) if it is spring and summer.
The blue sea of the Japan Sea is the most beautiful.
If it is autumn, I will recommend the Bnetsu West Line(磐越西線=Banetsu-Sai-Sen) line.
It is a route running through the mountains, but the autumn colors of the mountains are very beautiful.
If in the winter I recommend a Chuo line(中央線=Chuo-Sen same as Chuo East Line).
You can enjoy changing climbing mountains from a city without snow and going to a snowy landscape.