Castellnou de Seana Winter Main Festival Activity · Castellnou de Seana, Pla d'Urgell, Lleida Image of Castellnou de Seana, not of the place itself. Castellnou de Seana's Festa Major d'Hivern is held in a municipality located north of the river Corb, from which Vila-sana was separated in 1940, and which exceeded 1,500 inhabitants in 1920 before beginning a long demographic decline. Photo: Josep Salvany i Blanch (Public domain) What to see and do in Castellnou de Seana