Where was Saxony?
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).
Saxony
The Free State of Saxony was reconstituted with slightly altered borders in 1990, following German reunification. Besides the formerly Silesian area of Saxony, which was mostly included in the territory of the new Saxony, the free state gained further areas north of Leipzig that had belonged to Saxony-Anhalt since 1952.