It is approximately 400 kilometers along it's east-west axis and about 250 kilometres north to south.
To the west and south curve the mighty Alzgebirgs beyond which lie the realms of the Gallispania and of the Italians respectively. These are intersected by five mountain passes which the military geographer may divide into First, Second and Third Class roads. The first and second class roads are guarded by old fortresses that date back to the first half of the fifteenth century; the First class roads are guarded as at the town of Finke by latterly erected modern fortresses to M. Vauban's system of fortification. At the same time as these fortifications were built, the old forts on the secondary roads were graced with diverse outworks; Ravelins &c.
The old Fortress at Finke.
To the North and East run the gentle loops and meanderings of the Mur Flusse. This river's great flow is fed by tributary rivers arising in the Alzgebirgs, the Themse and Grossehaber. Paralleling their course, but not joining the system is the Isar which runs it's course to the south and east, creating the Waldsee and the marshy, forested country in the hills East of Grunwald. This swamp eventually finds it's way via a network of small lakes into the Neider Iser which gently waters the Uckermark in the South-East of the country.
These rivers are the highways of the country and so are guarded as potential invasion routes by the bluff-built fortress of Prenzlau which guards against the sundry Princes of the Germanies, the small fortress at Rosenthal (which watches the Bavarians) and those of Grunwald and Gunzbad which along with the Grunwald marshes are the Eastern bulwark in case the Empire should ever attempt to replicate the depredations of the Thirty Years' War.
The singular feature of Alzheim is the Great Escarpment which cuts across the South-western portion of the land. This is Alzheim's national redoubt, which, although not seriously fortified since Mediaeval times, has nonetheless been the refuge of the people as recently as the 30 Years' War when Bavarian and Imperial armies ravaged across the land.