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).
Old Saxony
The primitive bonds of kindred and clan were particularly strong among the Saxons, and in spite of many divisions the Saxons were an unusually homogeneous nation living as late as the 8th century as the early Germans described by Tacitus in "Germania" had lived. The long warfare with the Franks largely reduced but did not wholly obliterate their distinct cultural identity.Adam of Bremen, writing in the 11th century, compared the shape of Old Saxony to a triangle, and estimated from angle to angle the distance was eight days journey. In area Old Saxony was the greatest of the German tribal duchies. It included the entire territory between the lower Elbe and Saale rivers almost to the Rhine. Between the mouths of the Elbe and the Weser it bordered the North Sea. The only parts of the territory which lay across the Elbe were the counties of Holstein and Ditmarsch. The tribal lands were roughly divided into four kindred groups: the "Angrians", along the right bank of the Weser; the "Westphalians", along the Ems and the Lippe; the "Eastphalians", on the left bank of the Weser; and the "Nordalbingians", in modern Holstein. But not even with these four tribal groups was the term of tribal division reached. For the Saxon “nation” was really a loose collection of clans of kindred stock. For example, the Nordalbingians alone were divided into lesser groups: "Holsteiners", "Sturmarii", "Bardi", and the men of "Ditmarsch".