Upper Saxony
It was particularly to distinguish the lands from 'Lower Saxony', a concept which arose later in popular usage (though never enforced) as a term for the original Saxon lands in north and west Germany (where Low German dialects had spread), in what is now the state of Lower Saxony, as well as the adjacent Westphalian region, Holstein and the western part of today's Saxony-Anhalt north of the Harz range (Eastphalia).
Province of Saxony
The Province of Saxony was one of the richest regions of Prussia, with highly developed agriculture and industry. In 1932, the province was enlarged with the addition of the regions around Ilfeld and Elbingerode, which had previously been part of the Province of Hanover.