History of Friedrich II of Prussia — Volume 12

Schlesien, what we call Silesia, lies in elliptic shape, spread on the top of Europe, partly girt with mountains, like the crown or crest to that part of the Earth;—highest table-land of Germany or of the Cisalpine Countries; and sending rivers into all the seas. The summit or highest level of it is in the southwest; longest diameter is from northwest to southeast. From Crossen, whither Friedrich is now driving, to the Jablunka Pass, which issues upon Hungary, is above 250 miles; the AXIS, therefore, or longest diameter, of our Ellipse we may call 230 English miles;—its shortest or conjugate diameter, from Friedland in Bohemia (Wallenstein's old Friedland), by Breslau across the Oder to the Polish Frontier, is about 100. The total area of Schlesien is counted to be some 20, 000 square miles, nearly the third of England Proper.