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).
Amt Neuhaus
In the course of the eastern colonisation the area of today's Amt Neuhaus became a part of the Duchy of Saxony. The area was named as the "Land of Darzing", when the co-ruling Saxon dukes Albert II and his nephews Albert III, Eric I and John II partitioned Saxony into Saxe-Lauenburg and Saxe-Wittenberg before 20 September 1296. The Land of Darzing was then a part of Saxe-Lauenburg, colloquially also called "Lower Saxony".