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This view of Montjovet, Val d’Aosta, is taken from near Berriaz. Turner painted a similar subject in a watercolour study of Montjovet Castle, Val d’Aosta, from near Berriaz (private collection, USA).1
Andrew Wilton, The Life and Work of J.M.W. Turner, Fribourg 1979, p.472 no 1437, as ‘An Alpine Pass’.